Neodymium(III) oxide

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]

Neodymium(III) oxide
Names
IUPAC name
Neodymium(III) oxide
Other names
Neodymium oxide, Neodymium sesquioxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.832
EC Number
  • 215-214-1
UNII
Properties
Nd2O3
Molar mass 336.48 g/mol
Appearance light bluish gray hexagonal crystals
Density 7.24 g/cm3
Melting point 2,233 °C (4,051 °F; 2,506 K)
Boiling point 3,760 °C (6,800 °F; 4,030 K)[1]
.0003 g/100 mL (75 °C)
+10,200.0·10−6 cm3/mol
Structure
Hexagonal, hP5
P-3m1, No. 164
Thermochemistry
111.3 J·mol−1·K−1[1]
158.6 J·mol−1·K−1
Std enthalpy of
formation (ΔfH⦵298)
 −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 otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Uses

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

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

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gollark: Why would they abandon a second generation silver egg, I wonder.
gollark: Though scripts cost that much, and I've seen fewer of them than xenowyrms, possibly due to biomes.

References
  1. 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. 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
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