Yttrium(III) oxide
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Yttrium oxide, also known as yttria, is Y2O3. It is an air-stable, white solid substance.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Yttrium(III) oxide. | |
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⦵) |
-1816.609 kJ/mol [3] |
Hazards | |
Lethal dose or concentration (LD, LC): | |
LDLo (lowest published) |
>10,000 mg/kg (rat, oral) >6000 mg/kg (mouse, oral)[4] |
Related compounds | |
Other anions |
Yttrium(III) sulfide |
Other cations |
Scandium(III) oxide, Lutetium(III) oxide |
Related compounds |
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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The thermal conductivity of yttrium oxide is 27 W/(m·K).[5]