Study of Ferroelectric Phase Transitions in the Rochelle Salt with the Pseudo-Spin-Lattice Coupled Mode Model

1980 ◽  
Vol 49 (2) ◽  
pp. 608-618 ◽  
Author(s):  
Bijay Krishna Chaudhuri ◽  
Tooru Atake ◽  
Suvra Ganguli ◽  
Hideaki Chihara
Keyword(s):  
Phase Transitions ◽  
Ferroelectric Phase ◽  
Rochelle Salt ◽  
Spin Lattice ◽  
Coupled Mode ◽  
Ferroelectric Phase Transitions

scholarly journals Influence of Relaxing Defects on the Paraelectric-Ferroelectric Phase Transitions of Rochelle Salt

1979 ◽  
Vol 34 (5) ◽  
pp. 538-547 ◽  
Author(s):  
J. Petersson
Keyword(s):  
Phase Transitions ◽  
Ferroelectric Phase ◽  
Cell Model ◽  
Structural Phase ◽  
Crystal Defects ◽  
General Description ◽  
Rochelle Salt ◽  
Dielectric Polarization ◽  
Salt Crystals ◽  
Ferroelectric Phase Transitions

Abstract It is well known that different types of crystal defects influence the static and dynamic behaviour of the dielectric polarization of Rochelle salt crystals. Particularly strong effects appear near the paraelectric-ferroelectric phase transitions. In this paper it is shown that a slightly modified relaxing defect cell model which has been developed [1] in order to explain the narrow central peaks observed near structural phase transitions adequately describes the interaction between the strongly temperature dependent relaxational motion of the order parameter and the relaxational motions of the various defect modes. This theory is shown to be equivalent to a phenomenological Landau Khalatnikov approach, which so far has only been used to characterize the macroscopic dielectric behaviour of Rochelle salt crystals with defects near the phase transitions, and which in a previous work [16], has been developed in order to give a general description of central peak phenomena caused by defects. For instance the so called very fast after effect and its influence on the phase transitions is discussed in more detail.

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