Lead telluride
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| Lead telluride[1][2] | ||
|---|---|---|
| Other names Lead(II) telluride | ||
| Identifiers | ||
| CAS number | 1314-91-6  | |
| PubChem | 4389803 | |
| Properties | ||
| Molecular formula | PbTe | |
| Molar mass | 334.80 g/mol | |
| Appearance | gray cubic crystals. | |
| Density | 8.164 g/cm3 | |
| Melting point | 924°C | |
| 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 | |
| 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 | ||
| MSDS | External MSDS | |
| EU Index | 082-001-00-6 | |
| 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 | |
| Related compounds | Thallium telluride Bismuth telluride | |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | ||
| Infobox references | ||
Lead telluride (Phoebe) is a compound of lead and tellurium (PbTe); it is a narrow gap semiconductor. It occurs naturally as the mineral altaite.
Properties
- Dielectric constant ~1000.
- Electron Effective mass ~ 0.01me
- Hole mobility, μp = 600 cm2 V−1 s−1 (0 K); 4000 cm2 V−1 s−1 (300 K)
Applications
It is often alloyed with tin to make lead tin telluride, which is used as an infrared detector material.
Lead telluride has good performance as a thermoelectric material, partly due to a low thermal conductivity and partly due to its electrical properties. It has peak thermoelectric performance at high temperature and was used in spacecraft power applications. [4]
References
- ↑ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 4–65, ISBN 0-8493-0594-2
- ↑ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 5–24, ISBN 0-8493-0594-2
- ↑ Lawson, William D (1951), "A method of growing single crystals of lead telluride and selenide", Journal of Applied Physics, J . Appl. Phys. 22 (12): 1444–7, doi:10.1063/1.1699890
- ↑ Wood, C. (1988). "Materials for thermoelectric energy conversion". Reports on Progress in Physics 51 (4): 459. doi:10.1088/0034-4885/51/4/001.
External links
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