Lead telluride
Lead telluride, also known as lead(II) telluride, is a chemical compound. Its chemical formula is PbTe. It contains lead and telluride ions. The lead is in the +2 oxidation state.
| Lead telluride[1][2][3] | |
|---|---|
| Other names | Lead(II) telluride Altaite |
| Identifiers | |
| CAS number | |
| PubChem | |
| Properties | |
| Molecular formula | PbTe |
| Molar mass | 334.80 g/mol |
| Appearance | gray cubic crystals. |
| Density | 8.164 g/cm3 |
| Melting point |
924 °C, 1197 K, 1695 °F |
| Solubility in water | insoluble |
| Band gap | 0.25 eV (0 K) 0.32 eV (300 K) |
| Electron mobility | 1600 cm2 V−1 s−1 (0 K) 6000 cm2 V−1 s−1 (300 K) |
| Structure | |
| Crystal structure | Halite (cubic), cF8 |
| Space group | Fm3m, No. 225 |
| Lattice constant | a = 6.46 Angstroms |
| Coordination geometry |
Octahedral (Pb2+) Octahedral (Te2−) |
| Thermochemistry | |
| Std enthalpy of formation ΔfH |
-70.7 kJ·mol−1 |
| Std enthalpy of combustion ΔcH |
110.0 J·mol−1·K−1 |
| Standard molar entropy S |
50.5 J·mol−1·K−1 |
| Hazards | |
| EU classification | Repr. Cat. 1/3 Harmful (Xn) Dangerous for the environment (N) |
| R-phrases | R61, R20/22, R33, R62, R50/53 |
| S-phrases | S53, S45, S60, S61 |
| Flash point | Non-flammable |
| Related compounds | |
| Other anions | Lead(II) oxide Lead(II) sulfide Lead selenide |
| Other cations | Carbon monotelluride Silicon monotelluride Germanium telluride Tin telluride |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Properties
Lead telluride is a gray crystalline solid. It reacts with strong acids to make toxic hydrogen telluride and toxic lead salts.
Preparation
It may be made by melting lead and tellurium together.
Uses
It is used as a semiconductor and an infrared detector.
Related pages
References
- ↑ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, Florida: CRC Press, pp. 4–65, ISBN 978-0-8493-0594-8
- ↑ CRC Handbook.
- ↑ Lawson, William D (1951). "A method of growing single crystals of lead telluride and selenide". J. Appl. Phys. 22 (12): 1444–1447. doi:10.1063/1.1699890.