|Molar mass||225.81 g/mol|
|Density||5.010 g/cm3, solid|
|Melting point||2,425 °C (4,397 °F; 2,698 K)|
|Boiling point||4,300 °C (7,770 °F; 4,570 K)|
|Solubility in alcohol
|Cubic (bixbyite), cI80|
|Ia-3, No. 206|
|99.08 J/mol·K |
Std enthalpy of
|-190.5310 kJ/mol |
Gibbs free energy (ΔfG˚)
|-181.6609 kJ/mol |
|R-phrases (outdated)||Not hazardous|
|Lethal dose or concentration (LD, LC):|
LDLo (lowest published)
|>10,000 mg/kg (rat, oral)
>6000 mg/kg (mouse, oral)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Yttrium oxide, also known as yttria, is Y2O3. It is an air-stable, white solid substance. Yttrium oxide is used as a common starting material for both materials science as well as inorganic compounds.
The original use of the mineral yttria and the purpose of its extraction from mineral sources was as part of the process of making gas mantles and other products for turning the flames of artificially-produced gases (initially hydrogen, later coal gas, paraffin, or other products) into human-visible light. This use is almost obsolete - thorium and cerium oxides are larger components of such products these days.
It is the most important yttrium compound and is widely used to make Eu:YVO4 and Eu:Y2O3 phosphors that give the red color in color TV picture tubes. Yttrium oxide is also used to make yttrium iron garnets, which are very effective microwave filters.
Y2O3 is used to make the high temperature superconductor YBa2Cu3O7, known as "1-2-3" to indicate the ratio of the metal constituents:
- 2 Y2O3 + 8 BaO + 12 CuO + O2 → 4 YBa2Cu3O7
This synthesis is typically conducted at 800 °C.
Y2O3 is a prospective solid-state laser material. In particular, lasers with ytterbium as dopant allow the efficient operation both in continuous operation and in pulsed regimes. At high concentration of excitations (of order of 1%) and poor cooling, the quenching of emission at laser frequency and avalanche broadband emission takes place.
Yttriaite-(Y), approved as a new mineral species in 2010, is the natural form of yttria. It is exceedingly rare, occurring as inclusions in native tungsten particles in a placer deposit of the Bol’shaja Pol’ja river, Prepolar Ural, Siberia. As a chemical component of other minerals, the oxide yttria was first isolated in 1789 by Johan Gadolin, from rare-earth minerals in a mine at the Swedish town of Ytterby, near Stockholm.
- Yong-Nian Xu; Zhong-quan Gu; W. Y. Ching (1997). "Electronic, structural, and optical properties of crystalline yttria". Phys. Rev. B56 (23): 14993–15000. Bibcode:1997PhRvB..5614993X. doi:10.1103/PhysRevB.56.14993.
- R. Robie, B. Hemingway, and J. Fisher, “Thermodynamic Properties of Minerals and Related Substances at 298.15K and 1bar Pressure and at Higher Temperatures,” US Geol. Surv., vol. 1452, 1978.
- "Yttrium compounds (as Y)". Immediately Dangerous to Life and Health. National Institute for Occupational Safety and Health (NIOSH).
- P. H. Klein & W. J. Croft (1967). "Thermal conductivity , Diffusivity, and Expansion of Y2O3, Y3Al5O12, and LaF3 in the Range 77-300 K". J. Appl. Phys. 38 (4): 1603. Bibcode:1967JAP....38.1603K. doi:10.1063/1.1709730.
- J. Kong; D.Y.Tang; B. Zhao; J.Lu; K.Ueda; H.Yagi; T.Yanagitani (2005). "9.2-W diode-pumped Yb:Y2O3 ceramic laser". Applied Physics Letters. 86 (16): 161116. Bibcode:2005ApPhL..86p1116K. doi:10.1063/1.1914958.
- M.Tokurakawa; K.Takaichi; A.Shirakawa; K.Ueda; H.Yagi; T.Yanagitani; A.A. Kaminskii (2007). "Diode-pumped 188 fs mode-locked Yb3+:Y2O3 ceramic laser". Appl.Phys.Lett. 90 (7): 071101. Bibcode:2007ApPhL..90g1101T. doi:10.1063/1.2476385.
- J.-F.Bisson; D.Kouznetsov; K.Ueda; S.T.Fredrich-Thornton; K.Petermann; G.Huber (2007). "Switching of emissivity and photoconductivity in highly doped Yb3+:Y2O3 and Lu2O3 ceramics". Appl.Phys.Lett. 90 (20): 201901. Bibcode:2007ApPhL..90t1901B. doi:10.1063/1.2739318.
- Mindat, http://www.mindat.org/min-40471.html