Ordered Matter Science Research Center , Nanchang University , Nanchang , 330031 , People's Republic of China.
Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University , Nanjing 211189 , People's Republic of China.
J Am Chem Soc. 2018 Jul 5;140(26):8110-8113. doi: 10.1021/jacs.8b05037. Epub 2018 Jun 19.
It is known that perovskites with the general chemical formula of ABX (A, B = cations, X = anion) have been intensively studied over the last half century because of their diverse functional properties, such as ferroelectricity in BaTiO, piezoelectricity in PZT (lead zirconate titanate), and recently developed photovoltaic properties in CHNHPbI. However, rather less attention has been paid to their "inverse" analogs, antiperovskites, which have a chemical formula XBA, 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 XBA antiperovskite ferroelectric (CH)NH(MnBr) (where (CH)NH is X, MnBr is B, and MnBr 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.
人们已知，通式为 ABX（A、B=阳离子，X=阴离子）的钙钛矿在过去半个世纪受到了广泛研究，因为它们具有多种功能特性，如 BaTiO3 的铁电性、PZT（锆钛酸铅）的压电性以及最近在 CHNHPbI 中发现的光伏性能。然而，人们对其“反式”类似物反钙钛矿的关注较少，反钙钛矿的通式为 XBA，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，尚未发现反钙钛矿铁电体。在这里，我们首次报道了一种 XBA 反钙钛矿铁电体(CH)NH(MnBr)（其中(CH)NH 是 X，MnBr 是 B，MnBr 是 A），它表现出出色的铁电性，相变温度高达 458 K，同时还具有迷人的光致发光特性，具有两个强烈的发射。这一发现为探索高性能功能材料的反钙钛矿黄金领域开辟了新途径。
