Effect of dc electric field on conductivity and giant permittivity of KxTiyNi1-x-yO

被引：10

作者：

Jana, Pradip Kumar

Sarkar, Sudipta

Chaudhuri, B. K.

Sakata, H. ^{[1
]}

机构：

[1] Indian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, W Bengal, India

[2] Tokai Univ, Dept Appl Chem, Kanagawa 1117, Japan

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 24期

关键词：

D O I：

10.1063/1.2743929

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Activation energies (E-a) for electrode and grain boundary (GB) conduction are found to be greater than that of the bulk conduction. This implies that both electrode and GB act as two insulating barriers affecting conductivity and dielectric relaxations in KxTiyNi1-x-yO. Decrease in E-a for electrode conduction above T>295 K leads to relatively greater loss due to the dc-charge transportation between electrodes and dielectric. The Cole-Cole equation has been modified to explain epsilon(') over a wide range of frequency (10-10(7) Hz). Impedance spectroscopic study has also been employed to distinguish electrode relaxation from GB relaxation. (c) 2007 American Institute of Physics.

引用

页数：3

共 17 条

[1] Oxygen-vacancy-related low-frequency dielectric relaxation and electrical conduction in Bi:SrTiO3 [J].