首页 | 本学科首页   官方微博 | 高级检索  
     


Dielectric studies of the phase transition in {N(CH3)4}2HgCl4
Authors:K. Gesi
Affiliation:1. Department of Materials Science , College of Science &2. Engineering, Iwaki Meisei University , 5-5-1 Iino, Chuodai, Iwaki, Fukushima, 970, Japan
Abstract:Dielectric properties of single-crystal {N(CH3)4}2HgCl4 (structure at room temperature; orthorhombic Pmcn) have been measured in a temperature range from 4 K to about 370 K. The dielectric constant along the a-, b-, and c-axes shows a break at 278 K. No other anomalies are detected in the temperature range studied. The transition temperature increases linearly with increasing hydrostatic pressure at a rate of 0.20 K/MPa. Twin boundaries are observed in the low-temperature phase on b-plate specimens. The results indicate that the phase transition in {N(CH3)4}2HgCl4 is ferroelastic, as in {N(CH3)4}2XBr4 (X: Mn, Co, Zn).
Keywords:Tetramethylammonium mercury chloride  dielectric constant  phase transition
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号