Thermostimulated current, dielectric and EPR studies of the paraelectric phase of Ni-doped barium-strontium titanate ceramics

被引：0

作者：

Hafid, M. ^{[1
]}

Mouden, S. ^{[1
]}

Fukami, T. ^{[1
]}

Proust, C. ^{[1
]}

Husson, E. ^{[1
]}

机构：

[1] Univ of IBN Tofail, Kenitra, Morocco

来源：

Ferroelectrics | 1996年 / 186卷 / 1 -4 pt 4期

关键词：

Dielectric properties - Doping (additives) - Electric currents - Electron spin resonance spectroscopy - Ferroelectric materials - Nickel;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In order to understand the effect of the acceptor doping in perovskite type ceramics, dielectric properties of Ni-doped (Ba,Sr)TiO3 ceramics have been studied with the aid of Thermo-Stimulated Current (TSC) and Electron Paramagnetic Resonance (EPR). Dielectric properties of these ceramics doped up to 2% of nickel show an anomaly of epsilon around 250°C (paraelectric phase) depending strongly on the measurement frequency. The TSC studies suggest that this phenomenon is mainly due to dielectric rotation of impurity-vacancy dipoles localized on each grain surface. EPR measurements show that existence of Ni2+ and Ni3+ cations in the perovskite matrix, which implies the existence of Ni-Ti-Vo¯ dipole with oxygen vacancy introduced to compensate the charge excess.

引用

页码：173 / 176

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[1] THERMOSTIMULATED CURRENT, DIELECTRIC AND EPR STUDIES OF THE PARAELECTRIC PHASE OF NI-DOPED BARIUM-STRONTIUM TITANATE CERAMICS
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