Neodymium(III) oxide

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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 Edit this at Wikidata
EC Number
  • 215-214-1
UNII
  • InChI=1S/2Nd.3O
    Key: HBPPDPSYLUIKHU-UHFFFAOYSA-N
SMILES
  • O=[Nd]O[Nd]=O
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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Neodymium(III) oxide or neodymium sesquioxide is the

rare-earth mixture didymium, previously believed to be an element, partially consists of neodymium(III) oxide.[2]

Uses

Neodymium(III) oxide is used to dope

alexandrite appears blue in sunlight and red in artificial light.[5]
About 7000
catalyst.[4]

Reactions

Neodymium(III) oxide is formed when

neodymium(III) nitride or neodymium(III) hydroxide is roasted in air.[6]

Structure

Neodymium(III) oxide has a low-temperature trigonal A

form in space group P3m1.[7] This structure type is favoured by the early lanthanides.[8][9] At higher temperatures it adopts two other forms, the hexagonal H form in space group P63/mmc and the cubic X form in Im3m. The high-temperature forms exhibit crystallographic disorder.[10][11]

Crystal structure of the A form of neodymium(III) oxide
Packing Neodymium coordination Oxygen O1 coordination Oxygen O2 coordination
A-M2O3 structure type approximately capped octahedral octahedral approximately tetrahedral

References

  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
  7. ^ D. Taylor (1984). "Thermal Expansion Data: III Sesquioxides, U2N3, with the corundum and the A-, B- and C-M2O3 structures". Trans. J. Br. Ceram. Soc. 83: 92–98.
  8. ISBN 978-0-08-037941-8
    .
  9. ^ A. F. Wells (1984). Structural Inorganic Chemistry (5th ed.). Oxford University Press. pp. 544–547.
  10. doi:10.1002/zaac.19663430103
    .
  11. doi:10.1016/0025-5408(79)90095-3
    .
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