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首页> 外文期刊>Crystal growth & design >Switchable dielectric phase transition induced by ordering of twisting motion in 1,4-diazabicyclo[2.2.2]octane chlorodifluoroacetate
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Switchable dielectric phase transition induced by ordering of twisting motion in 1,4-diazabicyclo[2.2.2]octane chlorodifluoroacetate

机译：1,4-二氮杂双环[2.2.2]辛烷氯二氟乙酸酯中的扭曲运动引起的可切换介电相变

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摘要

A novel molecular electric ordered compound [(Hdabco)~+ClF _2CCOO-] (complex 1, dabco = 1,4-diazabicyclo[2.2.2]octane) has been discovered as a switchable dielectric material, in which the N-H?O hydrogen bonds connect the anions and cations together to form a dimer structure. It undergoes a reversible second order solid state phase transition at 165 K (T_c), which was confirmed by thermal analyses including differential scanning calorimetry (DSC) and specific heat (C _p) and dielectric measurements. Variable temperature single crystal X-ray diffraction analyses revealed its order-disorder transformation of twisting motion characteristic behaviors for the phase transition. Owing to the ordering of twisting motions of the chlorodifluoroacetate anions, the structure of 1 demonstrates a phase transition from high crystallographic symmetry with space group of Pnma to the low state with space group of P2_1/c; that is, an Aizu notion of mmmF2/m occurs. Emphatically, the dielectric constant of 1 displays a distinctive step-like anomaly; namely, it possesses a high dielectric state in the room temperature phase (RTP) and a low state in the low temperature phase (LTP). Such distinctive dielectric performances disclose that 1 might be considered as a potential switchable dielectric material. We believe that all the findings would afford a useful strategy in exploring new electric ordering materials.
机译：已发现一种新型的分子电有序化合物[（Hdabco）〜+ ClF _2CCOO-]（配合物1，dabco = 1,4-二氮杂双环[2.2.2]辛烷），是一种可转换的介电材料，其中的NH 3 O为氢键将阴离子和阳离子连接在一起以形成二聚体结构。它在165 K（T_c）处经历了可逆的二阶固态相变，这一点已通过热分析确认，包括差示扫描量热法（DSC）和比热（C _p）以及介电测量。可变温度单晶X射线衍射分析揭示了其扭曲运动特征行为的相序转换。由于氯二氟乙酸根阴离子的扭转运动的顺序，结构1表现出从具有Pnma空间群的高晶体对称性到具有P2_1 / c空间群的低态的相变;也就是说，会出现mmmF2 / m的会津概念。着重指出，介电常数1表现出独特的阶梯状异常;即，其在室温阶段（RTP）具有高介电态，而在低温阶段（LTP）具有低态。这种独特的介电性能表明1可以视为潜在的可切换介电材料。我们认为，所有发现将为探索新型电订购材料提供有用的策略。

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