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High-temperature formation phases and crystal structure of hot-pressed thermoelectric compounds with chalcopyrite-type structure

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Abstract

In this study, we introduced the temperature-dependent formation phases and crystallographic parameters of hot-pressed silver gallium telluride AgGaTe2 and copper gallium telluride CuGaTe2 with chalcopyrite structure from 300 to 800 K. These two compounds are potential thermoelectric materials in the intermediate temperature range; however, the temperature-dependent formation phases and crystallographic parameters of hot-pressed samples have not yet been analyzed in detail. The crystal structure analysis based on synchrotron X-ray diffraction (SXRD) measurements clarifies that impurity phases such as Te and Ag2Te in the AgGaTe2 matrix and Te and CuTe in the CuGaTe2 matrix appear at some temperature regions above 300 K. The existence of such impurity phases could be correlated with the increases of the electrical resistivity and Seebeck coefficient of the samples after multiple measurement cycles of the temperature-dependent transport properties from 300 to 800 K. The tetragonal lattice parameters a and c, tetragonal lattice volume, thermal expansion coefficients, tetragonal distortion, anion displacement parameter, and isotropic displacement parameter of the hot-pressed AgGaTe2 and CuGaTe2 were also analyzed. These crystallographic parameters are expected to substantially affect the thermoelectric properties of AgGaTe2 and CuGaTe2. Our results provide prospect of the long-term high-temperature stability and clues of the detailed analysis on the transport properties of hot-pressed AgGaTe2 and CuGaTe2, which should aid their development for thermoelectric applications.

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Acknowledgements

This work was financially supported by a Grant-in-Aid for Young Scientists (A) (No. 15H05548) of Japan, JST PRESTO of Japan (No. JPMJPR17R4) and the Program to Support Research Activities of Female Researchers in Osaka Prefecture University in Japan. Synchrotron radiation experiments were performed at SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI; Proposal Nos. 2014B1334, 2015A1363 and 2015B1377). We thank Prof. S. Yamanaka’s group at Osaka University, Japan for hot pressing AgGaTe2 and CuGaTe2.

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Authors and Affiliations

  1. Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, 599-8531, Japan

    Atsuko Kosuga, Yosuke Fujii & Akito Horie

  2. JST, PRESTO, Kawaguchi, Saitama, 332-0012, Japan

    Atsuko Kosuga

  3. Department of Electronics, Mathematics and Physics, Graduate School of Engineering, Osaka Prefecture University, Sakai, 599-8531, Japan

    Yosuke Fujii

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  1. Atsuko Kosuga
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Correspondence to Atsuko Kosuga.

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Kosuga, A., Fujii, Y. & Horie, A. High-temperature formation phases and crystal structure of hot-pressed thermoelectric compounds with chalcopyrite-type structure. Rare Met. 37, 360–368 (2018). https://doi.org/10.1007/s12598-018-1031-0

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  • DOI: https://doi.org/10.1007/s12598-018-1031-0

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