论文标题
手性分子晶体binol2dmso的铁电跃迁
Ferroelectric transition of a chiral molecular crystal BINOL2DMSO
论文作者
论文摘要
我们报告了手性分子晶体的介电，热力学，声学和光学特性，1,1'-BI-2-萘醇2-二甲基硫氧化物（Binol2DMSO）。我们发现在TC1 = 190 K和Tc2 = 125 K处的两个连续的相变。TC1时的第一个过渡的特征是客体分子DMSO的阶端端过渡以及铁电性。在TC2的第二个过渡时，晶体结构从四方到单斜晶的变形，导致域的形成。低温X射线衍射表明，空间组从p4_12_12（p4_32_12）变为TC1时的p4_1（p4_3），然后在TC2处变为p112_1。
We report dielectric, thermodynamical, acoustic, and optical properties of a chiral molecular crystal, 1,1'-bi-2-naphthol 2-dimethylsulfoxide (BINOL2DMSO). We find two successive phase transitions at Tc1=190 K and Tc2=125 K. The first transition at Tc1 is characterized by an order-disorder transition of the guest molecules DMSO along with ferroelectricity. At the second transition of Tc2, the crystal structure deforms from tetragonal to monoclinic, leading to domain formation. Low-temperature x-ray diffraction suggests that the space group changes from P4_12_12 (P4_32_12) to P4_1 (P4_3) at Tc1, and down to P112_1 at Tc2.
