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Lead(II) telluride

Lead(II) telluride

Other names	Lead telluride
Identifiers
CAS number	1314-91-6
Properties
Molecular formula	PbTe
Molar mass	334.80 g/mol
Density	8160 kg.m^-3
Melting point	924 °C
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Lead telluride is a compound of lead and tellurium (PbTe); it is a narrow gap semiconductor. The CAS registry number is 1314-91-6.

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Properties

Dielectric constant ~1000.
Electron Effective mass ~ 0.01m_e
Energy gap, ΔE_g=0.25 eV|_T=0 K; 0.32 eV|_T=300 K
Electron mobility, μ_n=1600 cm²/(V.s)>|_T=0 K6000 cm²/(V.s)>|_T=300 K
Hole mobility, μ_p=600 cm²/(V.s)>|_T=0 K4000 cm²/(V.s)>|_T=300 K

Applications

It is often alloyed with tin to make lead tin telluride, which is used as an infrared detector material. It also has good performance as a thermoelectric material, partly due to a low thermal conductivity.

It occurs naturally as the mineral altaite.