Yttrium(III) oxide

Yttrium(III) oxide
Names
	IUPAC name Yttrium(III) oxide.
	Other names Yttria,; diyttrium trioxide, ; yttrium sesquioxide
Identifiers
CAS Number	1314-36-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	140159;
ECHA InfoCard	100.013.849
EC Number	215-233-5;
PubChem CID	518711;
RTECS number	ZG3850000;
UNII	X8071685XT;
CompTox Dashboard (EPA)	DTXSID5051573 ;
	InChI InChI=1S/3O.2Y Key: SIWVEOZUMHYXCS-UHFFFAOYSA-N;
	SMILES O=[Y]O[Y]=O;
Properties
Chemical formula	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)
Solubility in water	insoluble
Magnetic susceptibility (χ)	+44.4·10−6 cm3/mol
Structure
Crystal structure	Cubic (bixbyite), cI80
Space group	Ia3 (No. 206)
Coordination geometry	Octahedral
Thermochemistry
Std molar; entropy (S⦵298)	99.08 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	-1905.310 kJ/mol
Gibbs free energy (ΔfG⦵)	-1816.609 kJ/mol
Hazards
	Lethal dose or concentration (LD, LC):
LDLo (lowest published)	>10,000 mg/kg (rat, oral); >6000 mg/kg (mouse, oral)
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). verify (what is ?) Infobox references

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.

Names

IUPAC name Yttrium(III) oxide.
Other names Yttria, diyttrium trioxide, yttrium sesquioxide
Identifiers
CAS Number	1314-36-9^Y
3D model (JSmol)	Interactive image
ChemSpider	140159
ECHA InfoCard	100.013.849
EC Number	215-233-5
PubChem CID	518711
RTECS number	ZG3850000
UNII	X8071685XT
CompTox Dashboard (EPA)	DTXSID5051573
InChI InChI=1S/3O.2Y Key: SIWVEOZUMHYXCS-UHFFFAOYSA-N
SMILES O=[Y]O[Y]=O
Properties
Chemical formula	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)
Solubility in water	insoluble
Magnetic susceptibility (χ)	+44.4·10⁻⁶ cm³/mol^[1]
Structure
Crystal structure	Cubic (bixbyite), cI80^[2]
Space group	Ia3 (No. 206)
Coordination geometry	Octahedral
Thermochemistry
Std molar entropy (S^⦵₂₉₈)	99.08 J/mol·K ^[3]
Std enthalpy of formation (Δ_fH^⦵₂₉₈)	-1905.310 kJ/mol ^[3]
Gibbs free energy (Δ_fG^⦵)	-1816.609 kJ/mol ^[3]
Hazards
Lethal dose or concentration (LD, LC):
LD_Lo (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). Y verify (what is ^YN ?) Infobox references