Chemistry:Praseodymium(III) oxide

Praseodymium(III) oxide

Pr3+      O2−
Names
IUPAC name Praseodymium(III) oxide
Other names Praseodymium oxide, Praseodymium sesquioxide
Identifiers
CAS Number	12036-32-7 Y
EC Number	234-845-3
PubChem CID	165911
Properties
Chemical formula	Pr2O3
Molar mass	329.813 g/mol
Appearance	light green solid
Density	6.9 g/cm3
Melting point	2,183 °C (3,961 °F; 2,456 K)
Boiling point	3,760 °C (6,800 °F; 4,030 K)
Magnetic susceptibility (χ)	+8994.0·10−6 cm3/mol
Structure
Crystal structure	Hexagonal, hP5
Space group	P-3m1, No. 164
Thermochemistry
Heat capacity (C)	117.4 J•mol−1•K−1
Std enthalpy of formation (ΔfH⦵298)	-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).
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Infobox references

Praseodymium(III) oxide, praseodymium oxide or praseodymia is the chemical compound composed of praseodymium and oxygen with the formula Pr₂O₃. It forms light green hexagonal crystals. Praseodymium(III) oxide crystallizes in the manganese(III) oxide or bixbyite structure.

Uses

Praseodymium(III) oxide can be used as a dielectric in combination with silicon. 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. For coloring ceramics, also the very dark brown mixed-valence compound praseodymium(III,IV) oxide, Pr₆O₁₁, is used.