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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Dielectric phase transition of an A(2)BX(4)-type perovskite with a pentahedral to octahedral transformation
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Dielectric phase transition of an A(2)BX(4)-type perovskite with a pentahedral to octahedral transformation

机译：介电相转变A（2）Bx（4）型钙钛矿与八半面向八面体变换

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Organic-inorganic hybrid compounds that undergo reversible dielectric phase transitions are a very attractive class of smart materials due to their wide applications in data storage, data communication and signal sensing. Here, a piperidine ring, C5H11N, was introduced into the inorganic lead halide perovskite scaffold to obtain three hybrid perovskite compounds, [C5H12N](2)PbCl4 (1), [C5H12N](2)PbBr4 (2), and [C5H12N]PbI3 (3). When compound 2 and compound 3 feature static two-dimensional (2D) and one-dimensional (1D) perovskite structures, respectively, it is striking that compound 1 shows a reversible pentahedral to octahedral transformation. It undergoes an above-room-temperature dielectric phase transition at T-c 352 K, wherein the high dielectric constant is more than twice the low dielectric constant. Structural analysis shows that 1 undergoes a phase transition from the space group Pnma at the low temperature phase (LTP) to C2/c at the high temperature phase (HTP). The phase transition originates from the order-disorder conversion of piperidinium cations. It is interesting to note that, the Pb2+ cations in the inorganic moieties change from five-coordinate at the LTP to six-coordinate at the HTP. The discovery of dielectric phase transition hybrid organic-inorganic lead halide perovskite materials further enhances the potential applications of high temperature responsive dielectric switchable materials.
机译：由于其在数据存储，数据通信和信号感测中的广泛应用，经过可逆介电相过渡的有机 - 无机杂化化合物是非常吸引人的智能材料。这里，将哌啶环C5H11n引入无机铅卤化物钙钛矿支架中，得到三种杂交钙钛矿化合物，[C5H12N]（2）PbCl4（1），[C5H12N]（2）PBBr4（2），和[C5H12N] PBI3（3）。当化合物2和化合物3分别具有静态二维（2D）和一维（1D）钙钛矿结构时，将化合物1显示出八半面制转化的可逆戊二族。它在T-C 352K处经历上室温介电相转变，其中高介电常数是低介电常数的两倍。结构分析表明，在高温相（HTP）下，1经历从空间组PNMA的相转变为C2 / C.相转移来自哌啶阳离子的秩序紊乱转化。值得注意的是，无机部分中的PB2 +阳离子从LTP的五个坐标变为HTP的六个坐标。介电相过渡杂交有机 - 无机铅卤化物钙钛矿的发现进一步增强了高温响应介电可切换材料的潜在应用。

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