Praseodymium(III) oxide
Chemical compound
From Wikipedia, the free encyclopedia
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− | |
-oxide.jpg) | |
| Names | |
|---|---|
| IUPAC name
Praseodymium(III) oxide | |
| Other names
Praseodymium oxide, Praseodymium sesquioxide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.031.665 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| 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).
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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.