Neodymium(III) oxide

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Neodymium(III) oxide
La2O3structure.jpg
Neodymium oxide 170g.jpg
Identifiers
CAS number 1313-97-9 YesY
Properties
Molecular formula Nd2O3
Molar mass 336.48 g/mol
Appearance light bluish gray hexagonal crystals
Density 7.24 g/cm3
Melting point 2233 °C
Boiling point 3760 °C[1]
Solubility in water .0003 g/100 mL (75°C)
Structure
Crystal structure Hexagonal, hP5
Space group P-3m1, No. 164
Thermochemistry
Specific
heat capacity
C
111.3 J·mol-1·K-1[1]
Std molar
entropy
So298
158.6 J·mol-1·K-1
Std enthalpy of
formation
ΔfHo298
-1807.9 kJ·mol-1
Related compounds
Other anions Neodymium(II) chloride
Neodymium(III) chloride
Other cations Uranium(VI) oxide
Praseodymium(III) oxide
Promethium(III) oxide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Neodymium(III) oxide or neodymium sesquioxide is the chemical compound composed of neodymium and oxygen with the formula Nd2O3. It forms very light grayish-blue hexagonal crystals.[1] The rare earth mixture didymium, previously believed to be an element, partially consists of neodymium(III) oxide.[2]

Uses[edit]

Neodymium(III) oxide is used to dope glass, including sunglasses, to make solid-state lasers, and to color glasses and enamels.[3] Neodymium-doped glass turns purple due to the absorbance of yellow and green light, and is used in welding goggles.[4] Some neodymium-doped glass is dichroic; that is, it changes color depending on the lighting. One kind of glass named for the mineral alexandrite appears blue in sunlight and red in artificial light.[5] About 7000 tonnes of neodymium(III) oxide are produced worldwide each year. Neodymium(III) oxide is also used as a polymerization catalyst.[4]

Reactions[edit]

Neodymium(III) oxide is formed when neodymium(III) nitride or neodymium(III) hydroxide is burned in air.[6]

References[edit]

  1. ^ a b c Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 471; 552, ISBN 0-8493-0594-2 
  2. ^ Brady, George Stuart; Clauser, Henry R.; Vaccari, John A. (2002), Materials Handbook (15 ed.), New York: McGraw-Hill Professional, p. 779, ISBN 978-0-07-136076-0, retrieved 2009-03-18 
  3. ^ Eagleson, Mary (1994), Concise Encyclopedia of Chemistry, Springer, p. 680, ISBN 978-3-11-011451-5, retrieved 2009-03-18 
  4. ^ a b Emsley, John (2003), Nature's Building Blocks, Oxford University Press, pp. 268–9, ISBN 978-0-19-850340-8, retrieved 2009-03-18 
  5. ^ Bray, Charles (2001), Dictionary of Glass (2 ed.), University of Pennsylvania Press, p. 103, ISBN 978-0-8122-3619-4, retrieved 2009-03-18 
  6. ^ Spencer, James Frederick (1919), The Metals of the Rare Earths, London: Longmans, Green, and Co, p. 115, retrieved 2009-03-18