Synthesis and Characterization of High-Entropy-Alloy-Type Layered Telluride M Bi2Te4 (M = Ag, In, Sn, Pb, Bi)

Yuki Nakahira; Seiya Shimono; Yosuke Goto; Akira Miura; Chikako Moriyoshi; Yoshikazu Mizuguchi

doi:10.3390/ma15072614

Synthesis and Characterization of High-Entropy-Alloy-Type Layered Telluride M Bi₂Te₄ (M = Ag, In, Sn, Pb, Bi)

Materials (Basel). 2022 Apr 1;15(7):2614. doi: 10.3390/ma15072614.

Authors

Yuki Nakahira¹, Seiya Shimono², Yosuke Goto¹, Akira Miura³, Chikako Moriyoshi⁴, Yoshikazu Mizuguchi¹

Affiliations

¹ Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji 192-0397, Japan.
² Department of Materials Science and Engineering, National Defense Academy, Kanagawa 239-8686, Japan.
³ Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Sapporo 060-8628, Japan.
⁴ Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima 739-8526, Japan.

Abstract

Recently, high-entropy alloys (HEAs) and HEA-type compounds have been extensively studied in the fields of material science and engineering. In this article, we report on the synthesis of a layered system MBi₂Te₄ where the M site possesses low-, middle-, and high-entropy states. The samples with M = Pb, Ag_1/3Pb_1/3Bi_1/3, and Ag_1/5In_1/5Sn_1/5Pb_1/5Bi_1/5 were newly synthesized and the crystal structure was examined by synchrotron X-ray diffraction and Rietveld refinement. We found that the M-Te2 distance was systematically compressed with decreasing lattice constants, where the configurational entropy of mixing at the M site is also systematically increased. The details of structural refinements and the electrical transport property are presented.

Keywords: PbBi2Te4; high-entropy alloy; layered compound; synchrotron XRD.

Abstract

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