Switching behaviour of modulated ferroelectrics I: kinetics of the field-induced lock-in transition of Rb2ZnCl4

被引：6

作者：

Elisbihani, K. ^{[1
]}

Gibhardt, H. ^{[1
]}

Eckold, G. ^{[1
]}

机构：

[1] Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2009年 / 11卷 / 17期

关键词：

MOLECULAR-DYNAMICS SIMULATION; COMMENSURATE PHASE-TRANSITION; INCOMMENSURATE PHASES; NEUTRON-DIFFRACTION; CRYSTALS;

D O I：

10.1039/b902368b

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：

The structural changes of ferroelectric Rb2ZnCl4 have been studied in real time under the influence of pulsed electric. fields by high-resolution gamma-ray diffraction close to the lock-in transition at 198.3 K. A well-defined. field-induced switching between the incommensurate and the commensurate phase is observed only in virgin crystals on a time-scale of milliseconds. Crystals aged under high electric. fields, however, exhibit an intermediate diffuse phase that is attributed to pinning effects of discommensurations, i.e. the walls of nano-domains in the incommensurate phase. Surprisingly, the incommensurate phase itself is stabilized and the transition into the ferroelectric phase is shifted to lower temperatures as soon as the frequency of the cycled electric. field is increased. This unusual finding is discussed in terms of stress. fields associated with the motion of discommensurations.

引用

页码：3168 / 3175

页数：8

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