Colossal dielectric response in all-ceramic percolative composite 0.65Pb(Mg1/3Nb2/3)O3-0.35PbTiO3-Pb2Ru2O6.5

被引：6

作者：

Bobnar, V. ^{[1
]}

Hrovat, M. ^{[1
]}

Holc, J. ^{[1
]}

Filipic, C. ^{[1
]}

Levstik, A. ^{[1
]}

Kosec, M. ^{[1
]}

机构：

[1] Jozef Stefan Inst, SI-1001 Ljubljana, Slovenia

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 03期

关键词：

composite materials; electrical conductivity; ferroelectric ceramics; lead compounds; percolation; permittivity; CRITICAL-BEHAVIOR; CONSTANT; THRESHOLD; CONDUCTIVITY; FERROELECTRICS; SYSTEM; TRANSPORT; CRYSTALS; METAL;

D O I：

10.1063/1.3075905

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An exceptionally high dielectric constant was obtained by making use of the conductive percolative phenomenon in all-ceramic composite, comprising of Pb2Ru2O6.5 with high electrical conductivity denoted as the conductive phase and ferroelectric 0.65Pb(Mg1/3Nb2/3)O-3-0.35PbTiO(3) (PMN-PT) perovskite systems. Structural analysis revealed a uniform distribution of conductive ceramic grains within the PMN-PT matrix. Consequently, the dielectric response in the PMN-PT-Pb2Ru2O6.5 composite follows the predictions of the percolation theory. Thus, close to the percolation point exceptionally high values of the dielectric constant were obtained-values higher than 10(5) were detected at room temperature at 1 kHz. Fit of the data, obtained for samples of different compositions, revealed critical exponent and percolation point, which reasonably agree with the theoretically predicted values.

引用

页数：5

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