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| Names | |
|---|---|
| IUPAC name
Yttrium(III) oxide.
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| Other names
Yttria,
diyttrium trioxide, yttrium sesquioxide | |
| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.013.849 |
| EC Number |
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PubChem CID
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA)
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| Properties | |
| Y2O3 | |
| Molar mass | 225.81 g/mol |
| Appearance | White solid. |
| Density | 5.010 g/cm3, solid |
| Melting point | 2,425 °C (4,397 °F; 2,698 K) |
| Boiling point | 4,300 °C (7,770 °F; 4,570 K) |
| insoluble | |
| +44.4·10−6 cm3/mol[1] | |
| Structure | |
| Cubic (bixbyite), cI80[2] | |
| Ia3 (No. 206) | |
| Octahedral | |
| Thermochemistry | |
Std molar
entropy (S⦵298) |
99.08 J/mol·K [3] |
Std enthalpy of
formation (ΔfH⦵298) |
-1905.310 kJ/mol [3] |
Gibbs free energy (ΔfG⦵)
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-1816.609 kJ/mol [3] |
| Hazards | |
| Lethal dose or concentration (LD, LC): | |
LDLo (lowest published)
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>10,000 mg/kg (rat, oral) >6000 mg/kg (mouse, oral)[4] |
| Related compounds | |
Other anions
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Yttrium(III) sulfide |
Other cations
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Scandium(III) oxide, Lutetium(III) oxide |
Related compounds
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Yttrium barium copper 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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Yttrium oxide, also known as yttria, is Y2O3. It is an air-stable, white solid substance.
The thermal conductivity of yttrium oxide is 27 W/(m·K).[5]
- ^ "Handbook of Chemistry and Physics 102nd Edition". CRC Press.
- ^ Yong-Nian Xu; Zhong-quan Gu; W. Y. Ching (1997). "Electronic, structural, and optical properties of crystalline yttria". Phys. Rev. B56 (23): 14993–15000. Bibcode:1997PhRvB..5614993X. doi:10.1103/PhysRevB.56.14993.
- ^ a b c R. Robie, B. Hemingway, and J. Fisher, “Thermodynamic Properties of Minerals and Related Substances at 298.15K and 1bar Pressure and at Higher Temperatures,” US Geol. Surv., vol. 1452, 1978. [1]
- ^ "Yttrium compounds (as Y)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
- ^ P. H. Klein & W. J. Croft (1967). "Thermal conductivity, Diffusivity, and Expansion of Y2O3, Y3Al5O12, and LaF3 in the Range 77-300 K". J. Appl. Phys. 38 (4): 1603. Bibcode:1967JAP....38.1603K. doi:10.1063/1.1709730.