It is known that perovskites with the general chemical formula of ABX3 (A, B = cations, X = anion) have been intensively studied over the last half century because of their diverse functional properties, such as ferroelectricity in BaTiO3, piezoelectricity in PZT (lead zirconate titanate), and recently developed photovoltaic properties in CH3NH3PbI3. However, rather less attention has been paid to their "inverse" analogs, antiperovskites, which have a chemical formula X3BA, where A and B are anions and X is a cation. Although most of important ferroelectrics are perovskites, no antiperovskite ferroelectrics have been found since the discovery of antiperovskites in 1930. Here, for the first time, we report a X3BA antiperovskite ferroelectric [(CH3)3NH]3(MnBr3)(MnBr4) (where (CH3)3NH is X, MnBr3 is B, and MnBr4 is A), which shows outstanding ferroelectricity with a significantly high phase transition temperature of 458 K as well as fascinating photoluminescence properties with two intense emissions. This finding opens a new avenue to explore the golden area of antiperovskites for high-performance functional materials.

中文翻译：

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[(CH3)3NH]3(MnBr3)(MnBr4)中反钙钛矿铁电体的发现

众所周知，化学式为 ABX3（A，B = 阳离子，X = 阴离子）的钙钛矿由于其不同的功能特性，如 BaTiO3 中的铁电性、PZT（铅锆钛酸酯），以及最近在 CH3NH3PbI3 中开发的光伏特性。然而，对它们的“反向”类似物反钙钛矿的关注较少，它具有化学式 X3BA，其中 A 和 B 是阴离子，X 是阳离子。尽管大多数重要的铁电体都是钙钛矿，但自 1930 年发现反钙钛矿以来，一直没有发现反钙钛矿铁电体。在这里，我们首次报道了 X3BA 反钙钛矿铁电体 [(CH3)3NH]3(MnBr3)(MnBr4)（其中(CH3)3NH 是 X，MnBr3 是 B，MnBr4 是 A)，它显示出出色的铁电性，具有 458 K 的显着高相变温度以及具有两种强烈发射的迷人光致发光特性。这一发现开辟了一条探索高性能功能材料反钙钛矿黄金领域的新途径。