Neodymium(III) oxide

Neodymium(III) oxide
Neodymium(III) oxide
CAS number 1313-97-9 YesY
Molecular formula Nd2O3
Molar mass 336.48 g/mol
Appearance light bluish gray hexagonal crystals
Density 7.24 g/cm3
Melting point


Boiling point


Solubility in water .0003 g/100 mL (75 °C)
Crystal structure Hexagonal, hP5
Space group P-3m1, No. 164
Std enthalpy of
-1807.9 kJ·mol-1
Standard molar
158.6 J·mol-1·K-1
Specific heat capacity, C 111.3 J·mol-1·K-1[1]
Related compounds
Other anions Neodymium(II) chloride
Neodymium(III) chloride
Other cations Uranium(VI) oxide
Praseodymium(III) oxide
Promethium(III) oxide
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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, 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]. 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 0849305942 
  2. ^ Brady, George Stuart; Clauser, Henry R.; Vaccari, John A. (2002), Materials Handbook (15 ed.), New York: McGraw-Hill Professional, pp. 779, ISBN 9780071360760,, retrieved 2009-03-18 
  3. ^ Eagleson, Mary (1994), Concise Encyclopedia of Chemistry, Springer, pp. 680, ISBN 9783110114515,, retrieved 2009-03-18 
  4. ^ a b Emsley, John (2003), Nature's Building Blocks, Oxford University Press, pp. 268–9, ISBN 9780198503408,, retrieved 2009-03-18 
  5. ^ Bray, Charles (2001), Dictionary of Glass (2 ed.), University of Pennsylvania Press, pp. 103, ISBN 9780812236194,, retrieved 2009-03-18 
  6. ^ Spencer, James Frederick (1919), The Metals of the Rare Earths, London: Longmans, Green, and Co, pp. 115,, retrieved 2009-03-18 

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