铁电性
电介质
热电性
结晶学
材料科学
凝聚态物理
二次谐波产生
差示扫描量热法
极化(电化学)
压电响应力显微镜
热力学
化学
物理化学
物理
光学
光电子学
激光器
作者
Yi Zhang,Heng‐Yun Ye,Wen Zhang,Ren‐Gen Xiong
摘要
Reaction of CdCl2 with cyclopentylamine in the presence of aqueous HCl affords an ABX3-typed perovskite structure compound [C5H9–NH3][CdCl3] (1). Above 300 K, it is in a paraelectric phase with a centrosymmetric space group Cmcm, while below 300 K it has a noncentrosymmetric space group Cc, corresponding to a ferroelectric phase. The temperature-dependent dielectric constant shows a peak at about 300 K with a 12-fold enhancement which is confirmed by differential scanning calorimetry. The normalized pyroelectric and second-harmonic generation effect as functions of temperature are almost overlapped, probably indicating that the trends with temperature basically satisfy the Landau phenomenological theory, revealing a symmetry-breaking occurrence. The ferroelectricity, a spontaneous saturation polarization approximately reaching 1.7 μC cm−2, is further confirmed by piezoresponse force microscopy.
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