Terbium(III) oxide
Chemical compound
From Wikipedia, the free encyclopedia
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.[3] It may be prepared by the reduction of Tb
4O
7 in hydrogen at 1300 °C for 24 hours.[4]
- Tb4O7 + H2 → 2 Tb2O3 + H2O
| |
| Names | |
|---|---|
| IUPAC name
terbium(III) oxide | |
| Other names
terbium trioxide, terbia, terbium sesquioxide | |
| Identifiers | |
3D model (JSmol) |
|
| ChemSpider | |
| ECHA InfoCard | 100.031.668 |
| EC Number |
|
PubChem CID |
|
CompTox Dashboard (EPA) |
|
| |
| |
| Properties | |
| 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) |
| 0.07834 cm3/mol | |
| Structure | |
| Cubic, cI80 | |
| Ia3, No. 206[1] | |
a = 1.057 nm | |
| Thermochemistry | |
Std molar entropy (S⦵298) |
156.90 J/mol·K [2] |
Std enthalpy of formation (ΔfH⦵298) |
−1865.23 kJ/mol [2] |
Gibbs free energy (ΔfG⦵) |
−1776.553 kJ/mol [2] |
| Hazards | |
| GHS labelling: | |
  | |
| Warning | |
| H319, H410 | |
| 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).
| |
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]
