Terbium(III) oxide

Terbium(III) oxide
Names
	IUPAC name terbium(III) oxide
	Other names terbium trioxide, terbia, terbium sesquioxide
Identifiers
CAS Number	12036-41-8 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.031.668
EC Number	234-849-5;
PubChem CID	159410;
CompTox Dashboard (EPA)	DTXSID40276469 ;
	InChI InChI=1/3O.2Tb/q3-2;2+3;
	SMILES [O-2].[O-2].[O-2].[Tb+3].[Tb+3];
Properties
Chemical formula	O3Tb2
Molar mass	365.848 g·mol−1
Appearance	white crystals
Density	7.91 g/cm3
Melting point	2,410 °C (4,370 °F; 2,680 K)
Magnetic susceptibility (χ)	0.07834 cm3/mol
Structure
Crystal structure	Cubic, cI80
Space group	Ia3, No. 206
Lattice constant	a = 1.057 nm
Thermochemistry
Std molar; entropy (S⦵298)	156.90 J/mol·K
Std enthalpy of; formation (ΔfH⦵298)	-1865.23 kJ/mol
Gibbs free energy (ΔfG⦵)	-1776.553 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H319, H410
Precautionary statements	P264, P273, P280, P305+P351+P338, P337+P313, P391, P501
Related compounds
Other anions	Terbium(III) chloride
Other cations	Gadolinium(III) oxide; Dysprosium(III) 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

Terbium(III) oxide, also known as terbium sesquioxide, is a sesquioxide of the rare earth metal terbium, having chemical formula Tb
₂O
₃. It is a p-type semiconductor, which conducts protons, which is enhanced when doped with calcium. It may be prepared by the reduction of Tb
₄O
₇ in hydrogen at 1300 °C for 24 hours.

Tb₄O₇ + H₂ → 2 Tb₂O₃ + H₂O

It is a basic oxide and easily dissolved to dilute acids, and then almost colourless terbium salt is formed.

Tb₂O₃ + 6 H⁺ → 2 Tb³⁺ + 3 H₂O

The crystal structure is cubic and the lattice constant is a = 1057 pm.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.