Preparation of CaMgSi and Ca7Mg7.25Si14 single phase films and their thermoelectric properties

MRS Advances volume 4, pages1503–1508(2019)Cite this article

Abstract

Ca-Mg-Si films were firstly prepared on (001)Al2O3 substrates by RF-magnetron sputtering method from Mg disc target together with Ca and Si chips. The composition of the deposited films was controlled by adjusting deposition temperature and Ca/Si area ratio of Ca and Si chips on Mg disk target. Ca0.32Mg0.33Si0.35 film deposited at 610 K consisted of a single phase of CaMgSi and this CaMgSi phase was stable after heat treated at 770 K under an atmospheric Ar with 5% -H2. As-deposited film shows the semiconductor behavior and have a power factor of 50 µW/(mK2) at 670 K, while annealed one showed the metallic behavior and its power factor down below 10 µW/(mK2) at 320-770 K. On the other hand, Ca0.27Mg0. 51Si0.2 film deposited at 590 K showed no obvious crystalline phase but became single phase of Ca7Mg7.25Si14 after heat treatment at 770 K under an atmospheric Ar with 5% -H2. As deposited film had a large power factor of 100 µW/(mK2) at 670 K. However, power factor decreased below 1 µW/(mK2) at 320-770K after the heat treatment at 770 K under an atmospheric Ar with 5% -H2.

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Affiliations

  1. Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama, 226-8502, Japan

    Matsuo Uehara, Mao Kurokawa & Masaaki Matsushima

  2. Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, 226-8502, Japan

    Atsuo Katagiri, Kensuke Akiyama, Takao Shimizu, Yoshisato Kimura & Hiroshi Funakubo

  3. Kanagawa Institute of Industrial Science and Technology, Ebina, Kanagawa, 243-0435, Japan

    Kensuke Akiyama

  4. Department of Materials and Life Sciences, Sophia University, Tokyo, 102-8554, Japan

    Hiroshi Uchida

Authors
  1. Matsuo Uehara
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  2. Atsuo Katagiri
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  3. Mao Kurokawa
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  4. Kensuke Akiyama
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  5. Takao Shimizu
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  6. Masaaki Matsushima
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  7. Hiroshi Uchida
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  8. Yoshisato Kimura
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  9. Hiroshi Funakubo
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Correspondence to Matsuo Uehara.

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Uehara, M., Katagiri, A., Kurokawa, M. et al. Preparation of CaMgSi and Ca7Mg7.25Si14 single phase films and their thermoelectric properties. MRS Advances 4, 1503–1508 (2019). https://doi.org/10.1557/adv.2019.129

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