An Order–Disorder Type High-Temperature Multiaxial Supramolecular Ferroelectric,Advanced Electronic Materials

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An Order–Disorder Type High-Temperature Multiaxial Supramolecular Ferroelectric
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-08-21 , DOI: 10.1002/aelm.202100635
Lei He ₁ , Ke Xu ₁ , Ping‐Ping Shi ₁ , Qiong Ye ₁ , Wen Zhang ₁

Affiliation

Much progress has been witnessed in exploring host–guest type ferroelectrics represented by ammonium-crown ether compounds. However, the major obstacles in expanding their promising applications in nonvolatile memory elements, capacitors, and sensors are relatively low Curie temperature (T_c) and uniaxial attribute. Herein, by screening different organic cations and inorganic anions to assemble with 18-crown-6 molecule, it is found that a new ammonium-crown ether inclusion ferroelectric 1, [(ATHTP)(18-crown-6)]BF₄ (ATHTP = protonated 4-aminotetrahydrothiopyran), undergoing a ferroelectric phase transition at a much higher T_c of 392 K which is comparable to BaTiO₃ (T_c = 393 K). Notably, the distinct symmetry breaking, that is, 4/mmmFmm2, leads to a biaxial ferroelectric with four equivalent directions of polarization. Such high T_c and multiaxial nature are rare in existing crown ether-based ferroelectrics. This work can help the exploration of high-T_c multiaxial ferroelectrics toward further device applications.

中文翻译：

一种有序-无序型高温多轴超分子铁电体

在探索以铵冠醚化合物为代表的主客体型铁电体方面取得了很大进展。然而，在非易失性存储元件、电容器和传感器中扩展其有前途的应用的主要障碍是相对较低的居里温度 ( _Tc)和单轴属性。在此，通过筛选不同的有机阳离子和无机阴离子与18-crown-6分子组装，发现了一种新型的铵-冠醚包合铁电体1，[(ATHTP)(18-crown-6)]BF ₄ (ATHTP = 质子化的 4-氨基四氢噻喃），在 392 K 的更高T _c下经历铁电相变，与 BaTiO ₃ ( T_c = 393 K)。值得注意的是，明显的对称性破缺，即 4/ mmmFmm 2，导致具有四个等效极化方向的双轴铁电体。这种高T _c和多轴性质在现有的冠醚基铁电体中是罕见的。这项工作有助于探索高T _c多轴铁电体，以实现进一步的器件应用。

更新日期：2021-08-21

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