Switchable Dielectric Behavior and Order‐Disorder Phase Transition in a New Organic‐Inorganic Hybrid Compound: (CH3NH3)4[InCl6]Cl,European Journal of Inorganic Chemistry

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Switchable Dielectric Behavior and Order‐Disorder Phase Transition in a New Organic‐Inorganic Hybrid Compound: (CH3NH3)4[InCl6]Cl
European Journal of Inorganic Chemistry ( IF 2.2 ) Pub Date : 2020-01-30 , DOI: 10.1002/ejic.201901303
Min Li ₁ , Guan-Cheng Xu ₁ , Wen-Bo Xin ₁ , Yin-Qiang Zhang ₁

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A new organic‐inorganic phase transition material (CH₃NH₃)₄[InCl₆]Cl (1), has been successfully synthesized and characterized. The compound undergoes a reversible first‐order phase transition at Curie temperature Tc=284 K, accompanied with a wide hysteresis of 12 K, which investigated by differential scanning calorimetry (DSC). The temperature dependence of the dielectric permittivity discloses an obvious step‐like dielectric anomaly. Single crystal X‐ray diffraction reveals that the order‐disorder transition of the [InCl₆]^3– anion and the methylammonium cation were the main factor drove the phase transition from high temperature phase with the space group P2/m to low temperature phase with the space group P2/n. This finding indicates that In‐based organic–inorganic hybrids compounds can be used to build phase transition materials, which broaden the way for exploring dielectric switching materials.

中文翻译：

（CH3NH3）4 [InCl6] Cl的新有机-无机杂化化合物的可切换介电行为和有序无序相变

一种新型的有机-无机相变材料（CH ₃ NH ₃）₄ [InCl ₆ ] Cl（1）已成功合成和表征。该化合物在居里温度Tc = 284 K处经历可逆的一阶相变，并伴随着12 K的宽滞后，这通过差示扫描量热法（DSC）进行了研究。介电常数的温度依赖性揭示了一个明显的阶梯状介电异常。X射线单晶衍射表明，[InCl ₆ ] ^3–阴离子和甲基铵阳离子的有序转变是驱动高温相与空间基团相变的主要因素。P 2 / m为低温相，空间群为P 2 / n。这一发现表明，基于In的有机-无机杂化化合物可用于构建相变材料，从而拓宽了探索介电开关材料的途径。

更新日期：2020-01-31

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