Perovskites go organic The perovskite structure accommodates many different combinations of elements, making it attractive for use in a wide variety of applications. Building perovskites out of only organic compounds is appealing because these materials tend to be flexible, fracture-resistant, and potentially easier to synthesize than their inorganic counterparts. Ye et al. describe a previously unknown family of all-organic perovskites, of which they synthesized 23 different family members (see the Perspective by Li and Ji). The compounds are attractive as ferroelectrics, including one compound with properties close to the well-known inorganic ferroelectric BaTiO3. Science, this issue p. 151; see also p. 132 A family of all-organic perovskites has attractive ferroelectric properties. Inorganic perovskite ferroelectrics are widely used in nonvolatile memory elements, capacitors, and sensors because of their excellent ferroelectric and other properties. Organic ferroelectrics are desirable for their mechanical flexibility, low weight, environmentally friendly processing, and low processing temperatures. Although almost a century has passed since the first ferroelectric, Rochelle salt, was discovered, examples of highly desirable organic perovskite ferroelectrics are lacking. We found a family of metal-free organic perovskite ferroelectrics with the characteristic three-dimensional structure, among which MDABCO (N-methyl-N'-diazabicyclo[2.2.2]octonium)–ammonium triiodide has a spontaneous polarization of 22 microcoulombs per square centimeter [close to that of barium titanate (BTO)], a high phase transition temperature of 448 kelvins (above that of BTO), and eight possible polarization directions. These attributes make it attractive for use in flexible devices, soft robotics, biomedical devices, and other applications.

中文翻译：

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无金属三维钙钛矿铁电体

钙钛矿走向有机钙钛矿结构可容纳许多不同的元素组合，使其在各种应用中都具有吸引力。仅用有机化合物构建钙钛矿很有吸引力，因为这些材料往往是柔韧的、抗断裂的，并且比无机材料更容易合成。叶等人。描述了一个以前未知的全有机钙钛矿家族，他们合成了其中的 23 个不同的家族成员（参见 Li 和 Ji 的观点）。这些化合物作为铁电体很有吸引力，其中包括一种性质接近于众所周知的无机铁电体 BaTiO3 的化合物。科学，这个问题 p。151; 另见第。132 全有机钙钛矿家族具有有吸引力的铁电特性。无机钙钛矿铁电体因其优异的铁电性和其他特性而广泛用于非易失性存储元件、电容器和传感器。有机铁电体因其机械柔韧性、重量轻、加工环境友好和加工温度低而备受青睐。尽管自第一个铁电体罗谢尔盐被发现以来已经过去了近一个世纪，但缺乏非常理想的有机钙钛矿铁电体的例子。我们发现了一系列具有特征三维结构的无金属有机钙钛矿铁电体，其中 MDABCO（N-甲基-N'-二氮杂双环 [2.2.2] octonium）-三碘化铵的自发极化为每平方 22 微库仑厘米 [接近钛酸钡 (BTO)]，448 开尔文的高相变温度（高于 BTO）和八个可能的极化方向。这些属性使其在柔性设备、软机器人、生物医学设备和其他应用中具有吸引力。