journal article·2021-05-24

Chemical-Pressure-Induced Point Defects Enable Low Thermal Conductivity for Mg2Sn and Mg2Si Single Crystals

Wataru Saito, Kei Hayashi, Zhicheng Huang, Kazuya Sugimoto, Kenji Ohoyama, Naohisa Happo, Masahide Harada, Kenichi Oikawa, Yasuhiro Inamura, Kouichi Hayashi, Takamichi Miyazaki, Yuzuru Miyazaki

ACS Applied Energy Materials· Volume 4· Issue 5
Publisher page

Abstract

The development of thermoelectric (TE) materials, which can directly convert waste heat into electricity, is vital to reduce the use of fossil fuels. Mg2Sn and Mg2Si are promising TE materials because of their superior TE performance. In this study, for future improvement of the TE performance, point defect engineering was applied to the Mg2Sn and Mg2Si single crystals (SCs) via boron (B) doping. Their crystal structures were analyzed via white neutron holography and SC X-ray diffraction. Moreover, nanostructures and TE properties of the B-doped Mg2Sn and Mg2Si SCs were investigated. The B-doping increased the chemical pressure on the Mg2Sn and Mg2Si SCs, leading to inducing vacancy defects as a point defect. No apparent change was observed in electronic transport, but thermal transport was significantly prevented. This study demonstrates that the vacancy defects can be controlled by the chemical pressure and can aid in achieving high TE performance for the Mg2Sn and Mg2Si SCs.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Superconductivity in MgB2 and Alloys · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

Institute of Quantum Beam Science, Graduate School of Science and Engineering, Ibaraki University, Tokai 319-1106, Japan

Department of Computer and Network Engineering, Graduate School of Information Sciences, Hiroshima City University, Hiroshima 731-3194, Japan

Materials and Life Science Division, J-PARC Center, Tokai 319-1195, Japan

Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan

Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Nagoya 466-8555, Japan

Department of Instrumental Analysis, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

Funding

Ministry of Education, Culture, Sports, Science and Technology · Tohoku University · Japan Society for the Promotion of Science · Sumitomo Metal Mining Co., Ltd · Japan Proton Accelerator Research Complex

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