Unique Freezing Dynamics of Flexible Guest Cations in the First Molecular Postperovskite Ferroelectric: (C5H13NBr)[Mn(N(CN)2)3],CCS Chemistry

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Unique Freezing Dynamics of Flexible Guest Cations in the First Molecular Postperovskite Ferroelectric: (C5H13NBr)[Mn(N(CN)2)3]
CCS Chemistry ( IF 9.4 ) Pub Date : 2019-10-01 , DOI: 10.31635/ccschem.019.20190012
Sha-Sha Wang ₁ , Xiao-Xian Chen ₁ , Bo Huang ₁ , Rui-Kang Huang ₁ , Wei-Xiong Zhang ₁ , Xiao-Ming Chen ₁

Affiliation

Ferroelectricity is usually found in cubic and hexagonal perovskites consisting of corner- and faced-shared BX6 octahedra, respectively. In contrast, another important branch of perovskites, postperovskites, which contain layers constructed by both edge- and corner-shared BX6 octahedra, have been much more scarcely studied and virtually absent in the fields of ferroelectricity since the discovery of postperovskite structure in 1965. In this study, we present for the first time a molecular postperovskite ferroelectric, (bromocholine) [Mn(N(CN)2)3], and demonstrate how spontaneous polarization arises from the freezing dynamics of bromocholine cations in a unique space confined by postperovskite layers. These findings suggest that postperovskites could serve as a new type of host– guest model in controlling the molecular dynamics of abundant polar cations in the development of novel ferroelectric materials.

中文翻译：

第一分子后钙钛矿铁电体中柔性客体阳离子的独特冻结动力学：（C5H13NBr）[Mn（N（CN）2）3]

铁电通常存在于立方和六方钙钛矿中，分别由角共享和面共享的BX6八面体组成。相比之下，自1965年发现钙钛矿后结构以来，铁电领域中钙钛矿的另一个重要分支，即钙钛矿，其包含由边缘和角共享的BX6八面体构成的层，在铁电领域中的研究很少，几乎没有。这项研究，我们首次提出分子钙钛矿后铁电体，（bromocholine）[Mn（N（CN）2）3]，并证明在钙钛矿化后层限定的独特空间中，溴化胆碱阳离子的冻结动力学是如何自发产生极化的。

更新日期：2020-06-24

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