鉛(II)テルリド

解説

鉛(II)テルリド,無色の立方晶系結晶．岩塩型構造．a ＝ 6.34 Å．融点905 ℃．密度8.16 g cm－3．水に不溶．HCl，HClO4，KOH水溶液などに侵されない．半導体で，バンドギャップ0.27 eV．抵抗率p型：5×10－3 Ω cm，n型：9×10－4 Ω cm．

応用

半導体材料，光電導体，熱電素子などのほか，IR検出用素子にも用いられる.

製造

鉛(II)テルリド,天然にもテルル鉛鉱(altaite)として産出する．N2 中，高温でPbとTeとを反応させるか，水溶液中でPb(NO3)2とNa2Teとを反応させると得られる．

化学的特性

Lead telluride, PbTe, forms white cubic crystals, sp gr 8.16, and has a hardness of 3 on the Mohs’ scale. It is very slightly soluble in water, melts at 917 °C, and is prepared by melting lead and tellurium together. Lead telluride has semiconductive and photoconductive properties.

使用

Lead telluride is used in pyrometry, in heat-sensing instruments such as bolometers and infrared spectroscopes, and in thermoelectric elements to convert heat directly to electricity. Lead telluride is also used in catalysts for oxygen reduction in fuel cells, as cathodes in primary batteries with lithium anodes, in electrical contacts for vacuum switches, in lead-ion selective electrodes, in tunable lasers, and in thermistors.

一般的な説明

This product has been enhanced for energy efficiency.

Structure and conformation

The space lattice of PbTe belongs to the cubic system, and its rock salt structure has a lattice constant of a=0.317 nm.