High-Pressure Synthesis of High-Entropy Metal-Chalcogenides

High-entropy alloys consisting of equal amounts of multiple elements are attracting much attention because their properties are far exceeding expectations. These have spread to compounds, and various metal oxides have been reported to be stabilized by the high-entropy effect. In this article, we overview the structures of simple metal-chalcogenides, MX and MX2 (X = S, Se), then introduce our recent study on the high-pressure synthesis of the high-entropy metal chalcogenides together with related studies. The notable point is that most of the compounds stabilized in simple structures such as NiAs-type in MX and pyrite-type in MX2 by increasing numbers of elements even though the original structure of MX/MX2 is different from NiAs-type/pyrite-type.