Design and Prominent Dielectric Properties of a Layered Phase-Transition Crystal: (Cyclohexylmethylammonium)2CdCl4

详细信息    查看全文

• 作者：Xing-Hui Lv ; Wei-Qiang Liao ; Zhong-Xia Wang ; Peng-Fei Li ; Chen-Yu Mao ; Heng-Yun Ye
• 刊名：Crystal Growth & Design
• 出版年：2016
• 出版时间：July 6, 2016
• 年：2016
• 卷：16
• 期：7
• 页码：3912-3916
• 全文大小：357K
• 年卷期：0
• ISSN：1528-7505

文摘

Following our recent finding of interesting dielectric and ferroelectric properties in semiconducting organic–inorganic layered perovskites (benzylammonium)₂PbCl₄ and (cyclohexylammonium)₂PbBr_4–4xI_4x (x = 0–1), we designed a new layered perovskite-type crystal (cyclohexylmethylammonium)₂CdCl₄. By systematic characterizations, including differential scanning calorimetry measurements, dielectric measurements, and variable-temperature structural analysis, this crystal was found to undergo a reversible first-order phase transition at around T_c = 342 K. The origin of the phase transition is associated with the order–disorder change of the organic cation as expected. The phase transition is accompanied by the anticipated large dielectric constant change and remarkable dielectric anisotropy. These dielectric performances reveal potential application of the crystal as a high-temperature dielectric material. More interesting dielectric crystals are expected to be tailored in the future by taking advantage of the richness of layered perovskites.