Praseodymium(III) oxide

Praseodymium(III) oxide

Names
IUPAC name Praseodymium(III) oxide
Other names Praseodymium oxide, Praseodymium sesquioxide
Identifiers
CAS Number	12036-32-7
EC Number	234-845-3
PubChem	165911
Properties
Chemical formula	Pr2O3
Molar mass	329.813 g/mol
Appearance	white hexagonal crystals
Density	6.9 g/cm^3
Melting point	2,183 °C (3,961 °F; 2,456 K)
Boiling point	3,760 °C (6,800 °F; 4,030 K)[1]
Structure
Crystal structure	Hexagonal, hP5
Space group	P-3m1, No. 164
Thermochemistry
Specific heat capacity (C)	117.4 J•mol^−1•K^−1[1]
Std enthalpy of formation (ΔfH^o298)	-1809.6 kJ•mol^−1
Related compounds
Other anions	Praseodymium(III) chloride Praseodymium(III) sulfide
Other cations	Neodymium(III) oxide Promethium(III) oxide Cerium(III) oxide
Related compounds	Uranium(VI) oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
verify (what is  ?)
Infobox references

Praseodymium(III) oxide or praseodymium oxide is the chemical compound composed of praseodymium and oxygen with the formula Pr₂O₃. It forms white hexagonal crystals.^[1] Praseodymium(III) oxide crystallizes in the manganese(III) oxide or bixbyite structure.^[2]

Uses

Praseodymium(III) oxide can be used as a dielectric in combination with silicon.^[2] Praseodymium-doped glass, called didymium glass, turns yellow and is used in welding goggles because it blocks infrared radiation. Praseodymium(III) oxide is also used to color glass and ceramics yellow.^[3] For coloring ceramics, also the very dark brown mixed-valence compound praseodymium(III,IV)oxide, Pr₆O₁₁, is used.

References

1. Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 478, 523, ISBN 0-8493-0594-2
2. Dabrowski, Jarek; Weber, Eicke R. (2004), Predictive Simulation of Semiconductor Processing, Springer, p. 264, ISBN 978-3-540-20481-7, retrieved 2009-03-18
3. Krebs, Robert E. (2006), The History and Use of our Earth's Chemical Elements, Greenwood Publishing Group, p. 283, ISBN 978-0-313-33438-2, retrieved 2009-03-18