Characteristic features of the molecular dynamics and phase transitions of mixed [(NH4)1-xRbx]3H(SO4)2 (x=0, 0.8, and 1) crystals using 1H and 87Rb NMR

被引：0

作者：

Lim, Ae Ran ^{[1
]}

机构：

[1] Jeonju Univ, Dept Sci Educ, Jeonju 560759, South Korea

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2012年 / 1010卷

关键词：

Mixed crystal; Ferroelectrics; Nuclear magnetic resonance; Phase transition; TRIAMMONIUM HYDROGEN DISULFATE; SPIN-LATTICE-RELAXATION; PROTONIC CONDUCTIVITY; DIELECTRIC-PROPERTIES; SUPERPROTONIC PHASE; (NH4)(3)H(SO4)(2); (NH4)3H(SO4)2; TEMPERATURE; CSHSO4; CSHSEO4;

D O I：

10.1016/j.molstruc.2011.11.013

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：

In this study, we grew [(NH4)(1-x)Rb-x](3)H(SO4)(2) (x = 0, 0.8, and 1) mixed crystals using a slow evaporation method and determined their lattice constants by X-ray diffraction. We investigated the molecular dynamics and phase transition temperatures of the crystals using H-1 and Rb-87 nuclear magnetic resonance (NMR) relaxation and differential scanning calorimetry. When a fraction of rubidium ions in the pure Rb3H(SO4)(2) crystal is partial replaced by ammonium ions, we compared the physical properties of the three types of crystals. A small amount of NH4+ added to Rb3H(SO4)(2) led to a change in the physical properties, bringing about a shift in phase transition temperatures and showed a superprotonic phase transition. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：32 / 37

页数：6

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