Nature of the cubic to rhombohedral structural transformation in (AgSbTe2)15(GeTe)85 thermoelectric material
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- B. A. Cook
- Iowa State University Ames Laboratory Materials and Engineering Physics Program, , Ames, Iowa 50011-3020
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- M. J. Kramer
- Iowa State University Ames Laboratory Materials and Engineering Physics Program, , Ames, Iowa 50011-3020
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- X. Wei
- Iowa State University Ames Laboratory Materials and Engineering Physics Program, , Ames, Iowa 50011-3020
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- J. L. Harringa
- Iowa State University Ames Laboratory Materials and Engineering Physics Program, , Ames, Iowa 50011-3020
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- E. M. Levin
- Iowa State University Ames Laboratory Material Chemistry Program, , Ames, Iowa 50011-3020 and Department of Physics and Astronomy, , Ames, Iowa 50011-3020
書誌事項
- 公開日
- 2007-03-01
- DOI
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- 10.1063/1.2645675
- 公開者
- AIP Publishing
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説明
<jats:p>The existence of a large thermoelectric figure of merit in (AgSbTe2)15(GeTe)85 has been known for many years. However, the nature of the crystallographic transformation in these materials from a high-temperature cubic to a low-temperature rhombohedral polymorph and its effect on electrical transport has not been clearly established. Transmission electron microscopy studies were performed that show extensive twinning in the low-temperature structure, resulting from lattice strain during the dilation along the (111) crystallographic direction. Analysis of differential scanning calorimetric studies indicates that the transformation is of second order, so that the high-temperature cubic phase is nonquenchable. High-temperature x-ray diffraction was performed to establish the transformation temperature, which was found to be complete upon heating at a temperature of 510K. Results of electrical conductivity measurements as a function of temperature on as-cast samples are discussed in terms of the observed twinning.</jats:p>
収録刊行物
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- Journal of Applied Physics
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Journal of Applied Physics 101 (5), 2007-03-01
AIP Publishing