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
EC Number	234-849-5
Jmol interactive 3D	Image
PubChem	159410
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	365.85 g·mol^−1
Appearance	white crystals
Density	7.91 g/cm^3
Melting point	2,410 °C (4,370 °F; 2,680 K)
Magnetic susceptibility (χ)	0.07834 cm^3/mol
Structure
Crystal structure	Cubic, cI80
Space group	Ia-3, No. 206[1]
Hazards
EU classification (DSD)	not listed
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).
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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 when doped with calcium,^[2] and may be prepared by the reduction of Tb
4O
7 in hydrogen at 1300 °C for 24 hours.^[3]

It is a p-type semiconductor.^[4]

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.^[5]

References

1. Curzon A.E., Chlebek H.G. (1973). "The observation of face centred cubic Gd, Tb, Dy, Ho, Er and Tm in the form of thin films and their oxidation". J. Phys. F 3 (1): 1–5. doi:10.1088/0305-4608/3/1/009.
2. Reidar Haugsrud, Yngve Larring, and Truls Norby (December 2005). "Proton conductivity of Ca-doped Tb
   2O
   3". Solid State Ionics (Elsevier B.V.) 176 (39–40): 2957–2961. doi:10.1016/j.ssi.2005.09.030.
3. G. J. McCarthy (October 1971). "Crystal data on C-type terbium sesquioxide (Tb
   2O
   3)". Journal of Applied Crystallography 4 (5): 399–400. doi:10.1107/S0021889871007295.
4. Reidar Haugsrud, Yngve Larring, and Truls Norby (December 2005). "Proton conductivity of Ca-doped Tb₂O₃". Solid State Ionics (Elsevier B.V.) 176 (39-40): 2957–2961. doi:10.1016/j.ssi.2005.09.030.
5. N. C. Baenzinger, H. A. Eick, H. S. Schuldt, L. Eyring: Terbium Oxides. III. X-Ray Diffraction Studies of Several Stable Phases. In: Journal of the American Chemical Society, 1961, 83, 10, S. 2219-23.