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.[1] Praseodymium(III) oxide crystallizes in the manganese(III) oxide or bixbyite structure.[2]
![]() Pr3+ O2− | |
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Names | |
---|---|
IUPAC name Praseodymium(III) oxide | |
Other names Praseodymium oxide, Praseodymium sesquioxide | |
Identifiers | |
ECHA InfoCard | 100.031.665 |
EC Number |
|
PubChem CID | |
CompTox Dashboard (EPA) | |
Properties | |
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)[1] |
+8994.0·10−6 cm3/mol | |
Structure | |
Hexagonal, hP5 | |
P-3m1, No. 164 | |
Thermochemistry | |
Heat capacity (C) | 117.4 J•mol−1•K−1[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). |
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
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