Deuteration-induced structural phase transitions in some hydrogen-bonded crystals

被引：26

作者：

Ichikawa, M ^{[1
]}

Matsuo, T ^{[1
]}

机构：

[1] OSAKA UNIV,FAC SCI,DEPT CHEM,TOYONAKA,OSAKA 560,JAPAN

来源：

JOURNAL OF MOLECULAR STRUCTURE | 1996年 / 378卷 / 01期

关键词：

isotope effect; heat capacity measurement; phase transition; hydrogen bonding;

D O I：

10.1016/0022-2860(95)09144-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A review is given, mainly based on heat capacity measurements, of the deuteration-induced structural phase transitions recently found in some rather diverse types of hydrogen-bonded crystals: i.e. M(3)H(XO(4))(2)-type crystals with strong hydrogen bonds, 9-hydroxyphenalenone derivatives with strong intramolecular hydrogen bonds, and (NH4)(2)MX(6)-type crystals with weak asymmetric hydrogen bonds. For M(3)H(XO(4))(2)-type crystals and 9-hydroxyphenalenone derivatives, the hydrogen-bond distance seems to be one of the determinant parameters, while for (NH4)(2)MX(6)-type crystals it is as yet unclear. However, some common characteristics of the heat capacity behavior are noted: (1) the magnitude of the transition entropy is compatible with order-disorder-type phase transitions, and (2) unusually the values of the heat capacity of the undeuterated compound are larger than those of the deuterated compound at the lowest temperature range.

引用

页码：17 / 27

页数：11

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