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{{Infobox yttrium}}
{{Infobox yttrium}}
'''Yttrium''' ({{pronEng|ˈɪtriəm}}) is a [[chemical element]] with symbol '''Y''' and [[atomic number]] 39. It is a silvery-metallic [[transition metal]] chemically similar to the [[lanthanoid]]s and has historically been classified as a [[rare-earth element]].<ref name=IUPAC/> Yttrium is almost always found combined with the lanthanoids in [[rare-earth mineral]]s and is never found in nature as a free element. Its only stable [[isotope]], <sup>89</sup>Y, is also its only naturally occurring isotope.
'''Penis''' ({{pronEng|ˈɪtriəm}}) is a [[chemical element]] with symbol '''Y''' and [[atomic number]] 39. It is a silvery-metallic [[transition metal]] chemically similar to the [[lanthanoid]]s and has historically been classified as a [[rare-earth element]].<ref name=IUPAC/> Yttrium is almost always found combined with the lanthanoids in [[rare-earth mineral]]s and is never found in nature as a free element. Its only stable [[isotope]], <sup>89</sup>Y, is also its only naturally occurring isotope.


In 1787, [[Carl Axel Arrhenius]] found a new mineral near [[Ytterby]] in Sweden and named it ''[[gadolinite|ytterbite]]'', after the village. [[Johan Gadolin]] discovered yttrium's oxide in Arrhenius' sample in 1789,<ref name="Krogt"/> and [[Anders Gustaf Ekeberg]] named the new oxide ''[[yttria]]''. Elemental yttrium was first isolated in 1828 by [[Friedrich Wöhler]].<ref name="LANL"/>
In 1787, [[Carl Axel Arrhenius]] found a new mineral near [[Ytterby]] in Sweden and named it ''[[gadolinite|ytterbite]]'', after the village. [[Johan Gadolin]] discovered yttrium's oxide in Arrhenius' sample in 1789,<ref name="Krogt"/> and [[Anders Gustaf Ekeberg]] named the new oxide ''[[yttria]]''. Elemental yttrium was first isolated in 1828 by [[Friedrich Wöhler]].<ref name="LANL"/>

Revision as of 15:26, 6 October 2008

Yttrium, 39Y
Yttrium
Pronunciation/ˈɪtriəm/ ​(IT-ree-əm)
Appearancesilvery white
Standard atomic weight Ar°(Y)
Yttrium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Sc
↑
Y
↓
Lu
strontium ← yttrium → zirconium
Atomic number (Z)39
Groupgroup 3
Periodperiod 5
Block  d-block
Electron configuration[Kr] 4d1 5s2
Electrons per shell2, 8, 18, 9, 2
Physical properties
Phase at STPsolid
Melting point1799 K ​(1526 °C, ​2779 °F)
Boiling point3203 K ​(2930 °C, ​5306 °F)
Density (at 20° C)4.469 g/cm3[3]
when liquid (at m.p.)4.24 g/cm3
Heat of fusion11.42 kJ/mol
Heat of vaporization363 kJ/mol
Molar heat capacity26.53 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1883 2075 (2320) (2627) (3036) (3607)
Atomic properties
Oxidation states0,[4] +1, +2, +3 (a weakly basic oxide)
ElectronegativityPauling scale: 1.22
Ionization energies
  • 1st: 600 kJ/mol
  • 2nd: 1180 kJ/mol
  • 3rd: 1980 kJ/mol
Atomic radiusempirical: 180 pm
Covalent radius190±7 pm
Color lines in a spectral range
Spectral lines of yttrium
Other properties
Natural occurrenceprimordial
Crystal structure ​hexagonal close-packed (hcp) (hP2)
Lattice constants
Hexagonal close packed crystal structure for yttrium
a = 364.83 pm
c = 573.17 pm (at 20 °C)[3]
Thermal expansion11.21×10−6/K (at 20 °C)[3][a]
Thermal conductivity17.2 W/(m⋅K)
Electrical resistivityα, poly: 596 nΩ⋅m (at r.t.)
Magnetic orderingparamagnetic[5]
Molar magnetic susceptibility+2.15×10−6 cm3/mol (2928 K)[6]
Young's modulus63.5 GPa
Shear modulus25.6 GPa
Bulk modulus41.2 GPa
Speed of sound thin rod3300 m/s (at 20 °C)
Poisson ratio0.243
Brinell hardness200–589 MPa
CAS Number7440-65-5
History
Namingafter Ytterby (Sweden) and its mineral ytterbite (gadolinite)
DiscoveryJohan Gadolin (1794)
First isolationFriedrich Wöhler (1838)
Isotopes of yttrium
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
87Y synth 3.4 d ε 87Sr
γ –
88Y synth 106.6 d ε 88Sr
γ –
89Y 100% stable
90Y synth 2.7 d β− 90Zr
γ –
91Y synth 58.5 d β− 91Zr
γ –
 Category: Yttrium
| references

Penis (Template:PronEng) is a chemical element with symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanoids and has historically been classified as a rare-earth element.[7] Yttrium is almost always found combined with the lanthanoids in rare-earth minerals and is never found in nature as a free element. Its only stable isotope, 89Y, is also its only naturally occurring isotope.

In 1787, Carl Axel Arrhenius found a new mineral near Ytterby in Sweden and named it ytterbite, after the village. Johan Gadolin discovered yttrium's oxide in Arrhenius' sample in 1789,[8] and Anders Gustaf Ekeberg named the new oxide yttria. Elemental yttrium was first isolated in 1828 by Friedrich Wöhler.[9]

The most important use of yttrium compounds is in making phosphors, such as the red ones used in television cathode ray tube displays and in LEDs.[10] Other uses include the production of electrodes, electrolytes, electronic filters, lasers and superconductors; various medical applications; and as traces in various materials to enhance their properties. Yttrium has no known biological role. Exposure to yttrium compounds can cause lung disease in humans.[11]

Characteristics

Properties

Yttrium is a soft, silver-metallic, lustrous and highly crystalline transition metal in group 3. As expected by periodic trends, it is less electronegative than its predecessor in the group, scandium, more electronegative than its successor in the group, lutetium, and less electronegative than the next member of period 5, zirconium.[12][13] Yttrium is the first d-block element in the fifth period.

The pure element is relatively stable in air in bulk form, due to passivation resulting from the formation of a protective oxide (Y
2O
3) film on its surface. This film can reach a thickness of 10 µm when yttrium is heated to 750 °C in water vapor.[14] When finely divided, however, yttrium is very unstable in air; shavings or turnings of the metal can ignite in air at temperatures exceeding 400 °C.[9] Yttrium nitride (YN) is formed when the metal is heated to 1,000 °C in nitrogen.[14]

Similarity to the lanthanoids

Further information: Rare earth element

The similarity of yttrium to the lanthanoids is so strong that the element has historically been grouped with them as a rare earth element,[7] and is always found in nature together with them in rare earth minerals.[15]

Chemically, yttrium resembles these elements more closely than its neighbor in the periodic table, scandium,[16] and if its physical properties were plotted against atomic number then it would have an apparent number of 64.5 to 67.5, placing it between the lanthanoids gadolinium and erbium.[17]

It often also falls in the same range for reaction order,[14] resembling terbium and dysprosium at its chemical reactivity.[10] Yttrium is so close in size to the so-called 'Yttrium group' of heavy lanthanoid ions that in solution, it behaves as if it were one of them.[14][18]

One of the few notable differences between the chemistry of yttrium and that of the lanthanoids is that yttrium is almost exclusively trivalent, whereas about half of the lanthanoids have valences other than three.[14]

Compounds and reactions

See also: Category:Yttrium compounds

As a trivalent transition metal, yttrium forms various inorganic compounds, generally in the oxidation state of +3, by giving up all three of its valence electrons.[19] A good example is yttrium(III) oxide (Y
2O
3), also known as yttria, a six-coordinate white solid.[20]

Yttrium forms a water-insoluble fluoride, hydroxide, and oxalate, but its bromide, chloride, iodide, nitrate and sulfate are all soluble in water.[14] The Y3+ ion is colorless in solution because of the absence of d and f electron shells.[14]

Electron shell diagram of yttrium

Water readily reacts with yttrium and its compounds to form hydrogen gas and Y
2O
3.[15] Concentrated nitric and hydrofluoric acids do not rapidly attack yttrium, but other strong acids do.[14]

With halogens, yttrium forms trihalides such as yttrium(III) fluoride (YF
3), yttrium(III) chloride (YCl
3), yttrium(III) bromide (YBr
3) at temperatures above roughly 200 °C.[11] Similarly, carbon, phosphorus, selenium, silicon and sulfur all form binary compounds with yttrium at elevated temperatures.[14]

Organoyttrium chemistry is the study of compounds containing carbon–yttrium bonds. A few of these are known to have yttrium in the oxidation state 0.[4][21] (The +2 state has been observed in chloride melts,[22] and +1 in oxide clusters in the gas phase.[23]) Some trimerization reactions were observed by using organoyttrium compounds as catalysts.[21] These compounds use YCl
3 as a starting material, which in turn is obtained from Y
2O
3 and concentrated hydrochloric acid and ammonium chloride.[24][25]

Hapticity is how a group of contiguous atoms of a ligand are coordinated to a central atom; it is indicated by the Greek character eta, η. Yttrium complexes were the first examples of complexes where carboranyl ligands were bound to a d0-metal center through a η7-hapticity.[21] Vaporization of the graphite intercalation compounds graphite–Y or graphite–Y
2O
3 leads to the formation of endohedral fullerenes such as Y@C82.[10] Electron spin resonance studies indicated the formation of Y3+ and (C82)3− ion pairs.[10] The carbides Y3C, Y2C, and YC2 can each hydrolyze to form hydrocarbons.[14]

Nucleosynthesis and isotopes

Main article: Isotopes of yttrium

Yttrium in the Solar System was created through stellar nucleosynthesis, mostly by the s-process (~72%), but also by the r-process (~28%).[26] The r-process consists of rapid neutron capture of lighter elements during supernova explosions. The s-process is a slow neutron capture of lighter elements inside pulsating red giant stars.[27]

Mira is an example of the type of red giant star where most of the yttrium in the solar system was created.

Yttrium isotopes are among the most common products of the nuclear fission of uranium occurring in nuclear explosions and nuclear reactors. In terms of waste management, the most important yttrium isotopes are 91Y and 90Y, with half-lives of 58.51 days and 64 hours, respectively.[28] The first is formed directly from fission, while the latter, despite its short half-life, is in secular equilibrium with its long-lived parent isotope, strontium-90 (90Sr) with a half-life of 29 years.[9]

All group 3 elements have an odd number of protons and therefore have few stable isotopes.[12] Yttrium itself has only one stable isotope, 89Y, which is also its only naturally occurring one. 89Y is thought to be more abundant than it otherwise would be, due in part to the s-process which allows enough time for isotopes created by other processes to decay by electron emission (neutron → proton).[27][note 1] Such a slow process tends to favor isotopes with mass numbers (A = protons + neutrons) around 90, 138 and 208, which have unusually stable atomic nuclei with 50, 82 and 126 neutrons, respectively.[27][note 2][29] 89Y has a mass number close to 90 and has 50 neutrons in its nucleus.

At least 32 synthetic isotopes of yttrium have been observed, ranging in mass number from 76 to 108.[28] The least stable of these is 106Y with a half-life of >150 ns (76Y has a half-life of >200 ns) and the most stable is 88Y with a half-life of 106.626 days.[28] Besides the isotopes 91Y, 87Y, and 90Y, with half lives of 58.51 days, 79.8 hours, and 64 hours, respectively, all the other isotopes have half lives of less than a day and most of those have half-lives of less than an hour.[28]

Yttrium isotopes with mass numbers at or below 88 decay primarily by positron emission (proton → neutron) to form strontium (Z = 38) isotopes.[28] Yttrium isotopes with mass numbers at or above 90 decay primarily by electron emission (neutron → proton) to form zirconium (Z = 40) isotopes.[28] Isotopes with mass numbers at or above 97 are also known to have minor decay paths of β− delayed neutron emission.[30]

Yttrium has at least 20 metastable or excited isomers ranging in mass number from 78 to 102.[28][note 3] Multiple excitation states have been observed for 80Y and 97Y.[28] While most of yttrium's isomers are expected to be less stable than their ground state, 78mY, 84mY, 85mY, 96mY, 98m1Y, 100mY, and 102mY have longer half-lives than their ground states, as these isomers decay by beta decay rather than isomeric transition.[30]

History

In 1787, army lieutenant and part-time chemist Carl Axel Arrhenius found a heavy black rock in an old quarry near the Swedish village of Ytterby (now part of the Stockholm Archipelago).[8] Thinking that it was an unknown mineral containing the newly discovered element tungsten,[31] he named it ytterbite[note 4] and sent samples to various chemists for further analysis.[8]

Johan Gadolin discovered yttrium oxide.

Johan Gadolin at the University of Åbo identified a new oxide or "earth" in Arrhenius' sample in 1789, and published his completed analysis in 1794.[32][note 5] Anders Gustaf Ekeberg confirmed this in 1797 and named the new oxide yttria.[33] In the decades after Antoine Lavoisier developed the first modern definition of chemical elements, it was believed that earths could be reduced to their elements, meaning that the discovery of a new earth was equivalent to the discovery of the element within, which in this case would have been yttrium.[note 6]

Carl Gustav Mosander found in 1843 that samples of yttria actually contained three oxides: yttria (white yttrium oxide), erbia (yellow terbium oxide) and the rose-colored terbia (erbium oxide).[note 7][34] A fourth oxide, ytterbium oxide, was isolated in 1878 by Jean Charles Galissard de Marignac.[35] New elements would later be isolated from each of those oxides, and each element was named, in some fashion, after Ytterby, the village near the quarry in which they were found (see ytterbium, terbium, and erbium).[36] In the following decades, seven other new metals were discovered in "Gadolin's yttria".[8] Since yttria was a mineral after all and not an oxide, Martin Heinrich Klaproth renamed it gadolinite in honor of Gadolin.[8]

Yttrium metal was first isolated in 1828 when Friedrich Wöhler heated anhydrous yttrium chloride with potassium:[37][38]

YCl3 + 3K → 3KCl + Y

Until the early 1920s, the chemical symbol Yt was used for the element, after which Y came into common use.[39]

In 1987, yttrium barium copper oxide was found to achieve high-temperature superconductivity.[40] It was only the second material known to exhibit this property,[40] and it was the first known material to achieve superconductivity above the (economically important) boiling point of nitrogen.[note 8]

Occurrence

Abundance

Xenotime crystals contain yttrium.

Yttrium is found in almost all rare earth minerals,[13] as well as some uranium ores, but it is never found in nature as a free element.[41] About 31 ppm of the Earth's crust is yttrium,[10] making it the 28th most abundant element there, and 400 times more common than silver.[42] Yttrium is found in soil in concentrations between 10 and 150 ppm (dry weight average of 23 ppm) and in sea water at 9 ppt.[42] Lunar rock samples collected during the Apollo program have a relatively high yttrium content.[36]

Yttrium has no known biological role, though it is found in most, if not all, organisms and tends to concentrate in the liver, kidney, spleen, lungs, and bones of humans.[43] There is normally as little as 0.5 milligrams found within the entire human body; human breast milk contains 4 ppm.[44] Yttrium can be found in edible plants in concentrations between 20 ppm and 100 ppm (fresh weight), with cabbage having the largest amount.[44] With up to 700 ppm, the seeds of woody plants have the highest known concentrations.[44]

Production

The chemical similarity of yttrium with the lanthanoids leads it to being enriched by the same processes and ends up in ores containing lanthanoids, forming rare earth minerals. A slight separation is recognized between the light (LREE) and the heavy rare earth elements (HREE) but this separation is never complete. Yttrium is concentrated in the HREE group even though it has a lower atomic mass.[45][46]

There are four main sources for REEs:[47]

  • Carbonate and fluoride containing ores such as the LREE bastnäsite ([(Ce, La, etc.)(CO3)F]) contain an average of 0.1%[45][9] of yttrium compared to the 99.9% for the 16 other REEs.[45] The main source for Bastnäsite from the 1960s to the 1990s was the Mountain Pass mine in California, making the United States the lagest producer of REEs.[47][45]
  • Monazite ([(Ce, La, etc.)PO4]), which is mostly phosphate, is a placer deposit of sand that is created by the transportation and gravitational separation of eroded granite. Monazite as a LREE ore contains 2%[45] (or 3%)[48] of yttrium. The largest deposits were found in India and Brazil in the early 19th century, making these two countries the largest producers of yttrium in the first half of that century.[47][45]
  • Xenotime, a REE phosphate, is the main HREE ore containing up to 60% of yttrium as yttrium phosphate (YPO3).[45] The largest mine for this mineral is the Bayan Obo deposit in China, making China the largest exporter for HREE since the closure of the Mountain Pass mine in the 1990s.[47][45]
  • Ion absorption clays or Lognan clays are the weathering products of granite and contain only 1% of REEs.[45] The final ore concentrate can contain up to 8% of yttrium. Ion absorption clays are mostly mined in southern China.[47][49][45]

Yttrium is also found in samarskite and fergusonite.[42]

It is difficult to separate yttrium from other rare earths. One method to obtain pure yttrium from the mixed oxide ores is to dissolve the oxide in sulfuric acid and fractionate it by ion exchange chromatography. With the addition of oxalic acid, the yttrium oxalate precipitates. The oxalate is converted into the oxide by heating under oxygen. By reacting the resulting yttrium oxide with hydrogen fluoride, yttrium fluoride is obtained.[50]

Annual world production of yttrium oxide had reached 600 tonnes by 2001, with reserves estimated at 9 million tonnes.[42] Only a few tonnes of yttrium metal are produced each year by reducing yttrium fluoride to a metal sponge with calcium magnesium alloy. The temperature of an arc furnace of above 1,600 °C is sufficient to melt the yttrium.[50][42]

Applications

Consumer

Yttrium is one of the elements used to make the red color in CRT televisions.

Yttria (Y
2O
3) is widely used to make YVO4:Eu and Y
2O
2S:Eu phosphors that give the red color in color television picture tubes,[10][9][note 9] though the red color itself is actually emitted from the europium while the yttrium collects energy from the electron gun and passes it to the phosphor.[51] Yttria is also used as a sintering additive in the production of porous silicon nitride[52] and as a common starting material for both material science and for producing other compounds of yttrium.

Yttrium compounds are used as a catalyst for ethylene polymerization.[9] As a metal, it is used on the electrodes of some high-performance spark plugs.[53] Yttrium is also used in the manufacturing of gas mantles for propane lanterns as a replacement for thorium, which is radioactive.[54]

Developing uses include yttrium-stabilized zirconia in particular as a solid electrolyte and as an oxygen sensor in automobile exhaust systems.[10]

Garnets

Yttrium is used in the production of a large variety of synthetic garnets,[55] and yttria is used to make yttrium iron garnets (YIG), which are very effective microwave filters.[29] Yttrium iron, aluminium, and gadolinium garnets (e.g. Y3Fe5O12 and Y3Al5O12) have important magnetic properties.[9] YIG is also very efficient as an acoustic energy transmitter and transducer.[56] Yttrium aluminium garnet (Y
3Al
5O
12 or YAG) has a hardness of 8.5 and is also used as a gemstone in jewelry (simulated diamond).[29] Cerium-doped yttrium aluminium garnet (YAG:Ce) crystals are used as phosphors to make white LEDs.[57][58][59]

YAG, yttria, yttrium lithium fluoride (LiYF
4), and yttrium orthovanadate (YVO
4) are used in combination with dopants such as neodymium, erbium, ytterbium in near-infrared lasers.[60][61] YAG lasers have the ability to operate at high power and are used for drilling into and cutting metal.[48] The single crystals of doped YAG are normally produced by the Czochralski process.[62]

Material enhancer

Small amounts of yttrium (0.1 to 0.2%) have been used to reduce the grain sizes of chromium, molybdenum, titanium, and zirconium.[63] It is also used to increase the strength of aluminium and magnesium alloys.[9] The addition of yttrium to alloys generally improves workability, adds resistance to high-temperature recrystallization and significantly enhances resistance to high-temperature oxidation (see graphite nodule discussion below).[51]

Yttrium can be used to deoxidize vanadium and other non-ferrous metals.[9] Yttria is used to stabilize the cubic form of zirconia for use in jewelry.[64]

Yttrium has been studied for possible use as a nodulizer in the making of nodular cast iron which has increased ductility (the graphite forms compact nodules instead of flakes to form nodular cast iron).[9] Yttrium oxide can also be used in ceramic and glass formulas, since it has a high melting point and imparts shock resistance and low thermal expansion characteristics.[9] It is therefore used in camera lenses.[42]

Medical and exotic

The radioactive isotope yttrium-90 is used in drugs such as Yttrium Y 90-DOTA-tyr3-octreotide and Yttrium Y 90 ibritumomab tiuxetan for the treatment of various cancers, including lymphoma, leukemia, ovarian, colorectal, pancreatic, and bone cancers.[44] It works by adhering to monoclonal antibodies, which in turn bind to cancer cells and kill them via intense β-radiation from the yttrium-90 (see Monoclonal antibody therapy).[65]

YBCO superconductor

Needles made of yttrium-90, which can cut more precisely than scalpels, have been used to sever pain-transmitting nerves in the spinal cord,[31] and yttrium-90 is also used to carry out radionuclide synovectomy in the treatment of inflamed joints, especially knees, in sufferers of conditions such as rheumatoid arthritis.[66]

A neodymium-doped yttrium-aluminium-garnet laser has been used in an experimental, robot-assisted radical prostatectomy in canines in an attempt to reduce collateral nerve and tissue damage,[67] whilst the erbium-doped ones are starting to be used in cosmetic skin resurfacing.[10]

Yttrium was used in the yttrium barium copper oxide (YBa2Cu3O7, aka 'YBCO' or '1-2-3') superconductor developed at the University of Alabama and the University of Houston in 1987.[40] This superconductor operated at 93 K, notable because this is above liquid nitrogen's boiling point (77.1 K).[40] As the price of liquid nitrogen is lower than that of liquid helium, which has to be used for the metallic superconductors, the operating costs would decrease. The created material was a black and green, multi-crystal, multi-phase mineral. Researchers are studying a class of materials known as perovskites that are alternative mixtures of these elements, hoping to eventually develop a practical high-temperature superconductor.[48]

Precautions

Water soluble compounds of yttrium are considered mildly toxic, while its insoluble compounds are non-toxic.[44] In experiments on animals, yttrium and its compounds caused lung and liver damage, though toxicity varies with different yttrium compounds. In rats, inhalation of yttrium citrate caused pulmonary edema and dyspnea, while inhalation of yttrium chloride caused liver edema, pleural effusions, and pulmonary hyperemia.[11]

Exposure to yttrium compounds in humans may cause lung disease.[11] Workers exposed to airborne yttrium europium vanadate dust experienced mild eye, skin, and upper respiratory tract irritation—though this may have been caused by the vanadium content rather than the yttrium.[11] Acute exposure to yttrium compounds can cause shortness of breath, coughing, chest pain, and cyanosis.[11] NIOSH recommends a time-weighted average limit of 1 mg/m3 and an IDLH of 500 mg/m3.[68] Yttrium dust is flammable.[11]

Notes

  1. ^ Essentially, a neutron becomes a proton while an electron and antineutrino are emitted.
  2. ^ This stability is thought to result from very low neutron cross-sections (Greenwood 1997, pp. 12–13). Electron emission of isotopes with those mass numbers is simply less prevalent due to this stability, resulting in them having a higher abundance.
  3. ^ Metastable isomers have higher-than-normal energy states than the corresponding non-excited nucleus and these states last until a gamma ray or conversion electron is emitted from the isomer. They are designated by an 'm' being placed next to the isotope's mass number.
  4. ^ Ytterbite was named after the village it was discovered near, plus the -ite ending to indicate it was a mineral.
  5. ^ Stwertka 1998, p. 115 says that the identification occurred in 1789 but is silent on when the announcement was made. van der Krogt 2005 cites the original publication, with the year 1794, by Gadolin.
  6. ^ Earths were given an -a ending and new elements are normally given an -ium ending
  7. ^ Confusingly, the names 'erbia' and 'terbia' were later swapped (van der Krogt 2005). The chemical names given in parenthesis indicate the compound Mosander actually discovered.
  8. ^ Tc for YBCO is 93 K and the boiling point of nitrogen is 77 K.
  9. ^ Emsley 2001, p. 497 says that "Yttrium oxysulfide, doped with europium (III), is used as the standard red component in colour televisions".

References

  1. ^ "Standard Atomic Weights: Yttrium". CIAAW. 2021.
  2. ^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  3. ^ a b c d Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.
  4. ^ a b Yttrium and all lanthanides except Ce and Pm have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev. 22: 17–24. doi:10.1039/CS9932200017. and Arnold, Polly L.; Petrukhina, Marina A.; Bochenkov, Vladimir E.; Shabatina, Tatyana I.; Zagorskii, Vyacheslav V.; Cloke (2003-12-15). "Arene complexation of Sm, Eu, Tm and Yb atoms: a variable temperature spectroscopic investigation". Journal of Organometallic Chemistry. 688 (1–2): 49–55. doi:10.1016/j.jorganchem.2003.08.028. Cite error: The named reference "Cloke1993" was defined multiple times with different content (see the help page).
  5. ^ Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
  6. ^ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
  7. ^ a b IUPAC 2005
  8. ^ a b c d e van der Krogt 2005
  9. ^ a b c d e f g h i j k Husted 2003, "yttrium"
  10. ^ a b c d e f g h Cotton 2008
  11. ^ a b c d e f g OSHA 2007
  12. ^ a b Greenwood 1997, p. 946
  13. ^ a b Hammond
  14. ^ a b c d e f g h i j Daane 1968, p. 817
  15. ^ a b Emsley 2001, p. 498
  16. ^ Daane 1968, p. 810
  17. ^ Daane 1968, p. 815
  18. ^ Greenwood 1997, p. 945
  19. ^ Greenwood 1997, p. 948
  20. ^ Greenwood 1997, p. 947
  21. ^ a b c Schumann 2006
  22. ^ Mikheev 1992
  23. ^ Kang 2005
  24. ^ Turner 1920, p. 492
  25. ^ Spencer 1919, p. 135
  26. ^ Pack 2007
  27. ^ a b c Greenwood 1997, pp. 12–13
  28. ^ a b c d e f g h NNDC 2008
  29. ^ a b c CRC 2008, v.4, p. 41
  30. ^ a b Audi 2003
  31. ^ a b Emsley 2001, p. 496 Cite error: The named reference "Emsley496" was defined multiple times with different content (see the help page).
  32. ^ Gadolin 1794
  33. ^ Greenwood 1997, p. 944
  34. ^ Mosander 1843
  35. ^ Britannica 2005, "ytterbium"
  36. ^ a b Stwertka 1998, p. 115
  37. ^ Heiserman 1992, p. 150
  38. ^ Wöhler 1828
  39. ^ Coplen and Peiser 1998
  40. ^ a b c d Wu et al. 1987
  41. ^ Lenntech, "yttrium"
  42. ^ a b c d e f Emsley 2001, p. 497
  43. ^ Mac Donald et al. 1952
  44. ^ a b c d e Emsley 2001, p. 495
  45. ^ a b c d e f g h i j Morteani 1991
  46. ^ Kanazawaa 2006
  47. ^ a b c d e Naumov 2008
  48. ^ a b c Stwertka 1998, p. 116
  49. ^ Zuoping 1996
  50. ^ a b Holleman 1985
  51. ^ a b Daane 1968, p. 818
  52. ^ US patent 5935888
  53. ^ Carley 2000
  54. ^ Addison 1985
  55. ^ Jaffe 1951
  56. ^ Hosseinivajargah 2007
  57. ^ US patent 6409938
  58. ^ GIA 1995
  59. ^ Kiss and Pressley 1996
  60. ^ Kong et. al. 2005
  61. ^ Tokurakawa et al. 2007
  62. ^ Aleksandar et al. 2002
  63. ^ PIDC contributors
  64. ^ Berg 2002
  65. ^ Adams et al. 2004
  66. ^ Fischer 2002
  67. ^ Gianduzzo 2008
  68. ^ NIOSH 2005

Bibliography

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  • Husted, Robert (2003-12-15). "Yttrium". Periodic Table of the Elements. Los Alamos National Laboratory. Retrieved 2008-08-02.
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External links

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