A research domain on the ferroelectric and dielectric switching characteristics of hybrid perovskites has been opened because of their excellent physical/chemical features upon exposure to CH₃NH₃PbI₃. To promote the development of applications, designing novel systems with superior performances is crucial. Here, we found [(CH₃)₃NOH][CdCl₃], a hybrid perovskite, could be considered to be a multi-stable switchable dielectric material at high temperatures. The temperature-dependent crystal structure and differential scanning calorimetry studies revealed that it underwent three phases at low, intermediate and high temperature. Moreover, the origin of the phase transitions could be ascribed mainly to the order–disorder of trimethylamine N-oxide cations. When the temperature increased from low to high, [(CH₃)₃NOH][CdCl₃] displayed a sequential switching effect with the dynamic change of organic cations. These findings provide an excellent model to develop molecule-based compounds as multi-switch materials.

中文翻译：

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具有双电介质ON / OFF开关的混合卤化物钙钛矿的热敏结构相变†

由于杂化钙钛矿在暴露于CH ₃ NH ₃ PbI ₃时具有优异的物理/化学特性，因此已经开启了研究铁电和介电转换特性的研究领域。为了促进应用程序的开发，设计性能卓越的新型系统至关重要。在这里，我们发现[（CH ₃）₃ NOH] [CdCl ₃钙钛矿杂化钙，可以认为是高温下的多稳态可切换介电材料。温度依赖性晶体结构和差示扫描量热法研究表明，它在低温，中温和高温下经历了三个阶段。此外，相变的起源可能主要归因于三甲胺N-氧化物阳离子的有序-无序。当温度从低到高升高时，[（CH ₃）₃ NOH] [CdCl ₃ ]随着有机阳离子的动态变化表现出顺序的转换效应。这些发现为开发基于分子的化合物作为多开关材料提供了一个极好的模型。