Neodymium(III) oxide

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Neodymium(III) oxide
Neodymium oxide 170g.jpg
IUPAC name
Neodymium(III) oxide
Other names
Neodymium oxide, Neodymium sesquioxide
3D model (JSmol)
ECHA InfoCard 100.013.832
EC Number
  • 215-214-1
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
Hexagonal, hP5
P-3m1, No. 164
111.3 J·mol−1·K−1[1]
158.6 J·mol−1·K−1
−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

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 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]


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


  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