Dielectric response of some ferroelectrics at "low" frequencies I

被引：6

作者：

Isnin, A ^{[1
]}

Jonscher, AK ^{[1
]}

机构：

[1] Univ London Royal Holloway & Bedford New Coll, Egham TW20 0EX, Surrey, England

来源：

FERROELECTRICS | 1998年 / 210卷 / 1-4期

关键词：

low frequency; ferroelectrics; universal" law;

D O I：

10.1080/00150199808229912

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dielectric response of ferroelectric PST ceramics and of TGS single crystals was measured in the seldom reported range 10(-3)-10(4) Hz. Their complex dielectric susceptance (X) over tilde(omega) = X'(omega) - iX "(omega) shows, after removal of processes such as direct-current conductivity, Low-Frequency Dispersion and certain dipolar features, underlying regions of relatively "flat" frequency dependence obeying the "universal" fractional power laws (X) over tilde(u)(omega) proportional to (i omega n(-1)) extending over five to seven decades of frequency. The magnitude of the power-law exponent n depends weakly on temperature and on the magnitude of the permittivity and depends only slightly, if at all, on the ferro- or para-electric stale of the sample. We note that this residual universal response is seen by us more clearly in ferroelectric materials than in any others. The significance of these results is discussed.

引用

页码：47 / 65

页数：19

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