Ordering and electric-field effects on the ferroelectric phase transition of some relaxors

被引：0
|
作者：
Kamzina, LS [1 ]
机构：
[1] RAS, AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia
来源：
FERROELECTRICS | 2001年 / 253卷 / 1-4期
关键词：
relaxor ferroelectrics; small-angle light scattering; percolation phase transition;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Optical transmission and small-angle light scattering (SALS) of PbSc1/2Ta1/2O3 (PST) and PbSc1/2Nb1/2O3(PSN) crystals with different degree of ions ordering, as well as PbMg1/3Nb2/3O3 (PMN) and PbZn1/3Nb2/3O3 (PZN) crystals were investigated under various dc-field. The first direct experimental evidence for the percolation nature of a spontaneous ferroelectric phase transition accompanied by an anomalous peak of SALS intensity has been received both in ordered and disordered stoichiometric PST and PSN crystals without electric field application. The application of electric field above some critical value is required to induce percolation phase transition in PMN crystal. Phase diagrams, with respect to dc field and temperature, were proposed for PST, PSN and PMN crystals.
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页码：619 / 626
页数：8
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