Giant dielectric response and polaronic hopping in charge-ordered Nd _(1.75)Sr_(0.25)NiO_4 ceramics

Liu X.Q.; Wu Y.J.; Chen X.M.

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Giant dielectric response and polaronic hopping in charge-ordered Nd _(1.75)Sr_(0.25)NiO_4 ceramics

机译：Giant dielectric response and polaronic hopping in charge-ordered Nd _(1.75)Sr_(0.25)NiO_4 ceramics

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摘要

The structure and dielectric properties of charge-ordered Nd _(1.75)Sr_(0.25)NiO_4 ceramics are presented. The giant dielectric constant about 30 000 is observed in the present ceramics even the frequency is up to 5 MHz. There are three dielectric relaxations at the curve of temperature dependence of dielectric constant in the considered temperature range. Based on the comparison of activation energies of dielectric relaxation and electrical conductivity, the giant dielectric response should be attributed to the bulk factor, that is, thermally activated small polaronic hopping in the present ceramics, while the dielectric relaxation around room temperature should cause from the effect of grain boundaries.

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来源
《Solid State Communications》 |2010年第38期|1794-1797|共4页
作者
Liu X.Q.; Wu Y.J.; Chen X.M.;
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Laboratory of Dielectric Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;

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原文格式 PDF
正文语种英语
中图分类固体物理学;
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C. Crystal structure and symmetry; D. Dielectric response; D. Electronic transport;

Giant dielectric response and polaronic hopping in charge-ordered Nd _(1.75)Sr_(0.25)NiO_4 ceramics

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