英国剑桥大学Thomas D. Bennett团队研究了有机-无机复合钙钛矿的熔融。 相关研究成果于2021年5月10日发表于国际顶尖学术期刊《自然—化学》。

金属-有机骨架（MOF）家族的几种有机-无机杂化材料在高温下可以形成稳定的液体。然后淬火形成保持晶相的三维配位键的熔融淬火MOF玻璃。这些杂化玻璃具有有趣的性质，可以在实际应用中得到应用，但迄今为止，熔融淬火现象仍然局限于少数MOF结构。

该文中，由于杂化有机-无机钙钛矿材料离子输运、光电导、铁电性和多铁性等功能特性，研究人员讨论了其在材料化学中的突出地位，并证明了一系列基于双氰胺的杂化有机-无机钙钛矿经历了熔融。综合实验-计算结果表明，在淬火时，它们形成的玻璃在很大程度上保留了固态无机-有机连接。所得材料显示出非常低的热导率（~0.2W m-1 K-1）、中等的导电率（103–105S m-1）和类似聚合物的热机械性能。

附：英文原文

Title: Melting of hybrid organic–inorganic perovskites

Author: Bikash Kumar Shaw, Ashlea R. Hughes, Maxime Ducamp, Stephen Moss, Anup Debnath, Adam F. Sapnik, Michael F. Thorne, Lauren N. McHugh, Andrea Pugliese, Dean S. Keeble, Philip Chater, Juan M. Bermudez-Garcia, Xavier Moya, Shyamal K. Saha, David A. Keen, Franois-Xavier Coudert, Frdric Blanc, Thomas D. Bennett

Issue&Volume: 2021-05-10

Abstract: Several organic–inorganic hybrid materials from the metal–organic framework (MOF) family have been shown to form stable liquids at high temperatures. Quenching then results in the formation of melt-quenched MOF glasses that retain the three-dimensional coordination bonding of the crystalline phase. These hybrid glasses have intriguing properties and could find practical applications, yet the melt-quench phenomenon has so far remained limited to a few MOF structures. Here we turn to hybrid organic–inorganic perovskites—which occupy a prominent position within materials chemistry owing to their functional properties such as ion transport, photoconductivity, ferroelectricity and multiferroicity—and show that a series of dicyanamide-based hybrid organic–inorganic perovskites undergo melting. Our combined experimental–computational approach demonstrates that, on quenching, they form glasses that largely retain their solid-state inorganic–organic connectivity. The resulting materials show very low thermal conductivities (~0.2W m1 K1), moderate electrical conductivities (103–105S m1) and polymer-like thermomechanical properties.

DOI: 10.1038/s41557-021-00681-7

Source: https://www.nature.com/articles/s41557-021-00681-7