Dielectric and structural relaxation phenomena in Na0.5Bi0.5TiO3 single crystal

被引：27

作者：

Suchanicz, J ^{[1
]}

Roleder, K ^{[1
]}

Kwapulinski, J ^{[1
]}

JankowskaSumara, I ^{[1
]}

机构：

[1] SILESIAN UNIV,INST PHYS,PL-40007 KATOWICE,POLAND

来源：

PHASE TRANSITIONS | 1996年 / 57卷 / 04期

关键词：

Na0.5Bi0.5TiO3 single crystal; dielectric dispersion; isothermal structural transformation;

D O I：

10.1080/01411599608208744

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Dielectric permittivity studies of Na0.5Bi0.5TiO3 Single crystals in a broad range of frequency up to 10 MHz and temperature 300-823 K are reported. In this temperature range dielectric dispersion below 1 MHz has been found. The obtained data were fitted to the Cole-Cole relation. The mean relaxation time tau is strongly temperature dependent (0.04-2.6 x 10(-5) s). A remarkable hysteresis effect in the values of tau on cooling and heating took place. The Delta epsilon(T) dependence (the maximal value of Delta epsilon similar to 400) is similar to the global epsilon'(T) response at low frequency. An isothermal structural transformation in Na0.5Bi0.5TiO3 was observed by X-ray measurements. The order of the time in which the transformation takes place (similar to 300 minutes) corresponds to the time in which the strongest time evolution of electric permittivity and time changes of dielectric dispersion were detected.

引用

页码：173 / 182

页数：10

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