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

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 BiTe where the site possesses low-, middle-, and high-entropy states. The samples with = Pb, AgPbBi, and AgInSnPbBi were newly synthesized and the crystal structure was examined by synchrotron X-ray diffraction and Rietveld refinement. We found that the -Te2 distance was systematically compressed with decreasing lattice constants, where the configurational entropy of mixing at the site is also systematically increased. The details of structural refinements and the electrical transport property are presented.