作为新型热电材料的复杂三元混合层状四钇硫属化合物

Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407) Pub Date : 1999-08-29 DOI:10.1109/ICT.1999.843446

L. E. Shelimova, P. Konstantinov, O. G. Karpinsky, E. S. Avilov, M. Kretova, J. Fleurial

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引用次数: 4

摘要

用x射线衍射研究了nGeTe-mBi/sub 2/Te/sub 3/和nGeTe-mSb/sub 2/Te/sub 3/同源系列混合层状(Mt.)化合物。在GeTe-Bi/sub - 2/Te/sub - 3/和GeTe-Sb/sub - 2/Te/sub - 3/准双星系统中发现了多种ML长周期结构。在较宽的温度范围内测量了霍尔系数、电阻率和塞贝克系数的温度依赖性。提出了声子和点缺陷的混合载流子散射机制来解释载流子迁移率在低温下的温度依赖性。发现ML化合物在300 K时晶格导热系数极低:/spl kappa//sub ph/=5-7 mW/cm K。

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Complex ternary mixed layered tetradymite-like chalcogenides as novel thermoelectrics

The nGeTe-mBi/sub 2/Te/sub 3/ and nGeTe-mSb/sub 2/Te/sub 3/ homologous series mixed layered (Mt.) compounds have been investigated by X-ray diffraction. A variety of the ML long-period structures is discovered in the GeTe-Bi/sub 2/Te/sub 3/ and GeTe-Sb/sub 2/Te/sub 3/ quasi-binary systems. Temperature dependencies of Hall coefficient, electrical resistivity and Seebeck coefficient have been measured in a wide temperature range. A mixed carrier scattering mechanism on acoustic phonons and point defects is proposed to explain the carrier mobility temperature dependence at low temperatures. It is found that the ML compounds are characterized by extremely low lattice thermal conductivity at 300 K: /spl kappa//sub ph/=5-7 mW/cm K.

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Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)

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