Relaxation and conduction mechanism of BNT-KNN ceramics by impedance study

被引：5

作者：

Chandrasekhar, M. ^{[1
]}

Kumar, P. ^{[1
]}

Prakash, C. ^{[2
]}

Kumar, Anil ^{[3
]}

机构：

[1] Natl Inst Technol, Dept Phys & Astron, Rourkela 769008, Odisha, India

[2] Solid State Phys Lab, Lucknow Rd, Delhi, India

[3] Govt Coll Women, Bawani Khera Bhiwani, Haryana, India

来源：

FERROELECTRICS | 2017年 / 517卷 / 01期

关键词：

Relaxation; impedance; modulus; conductivity; activation energy; COMPLEX IMPEDANCE; ENERGY; BT; BEHAVIOR; ACTUATOR;

D O I：

10.1080/00150193.2017.1369835

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Impedance spectra of 0.93BNT-0.07KNN revealed positive and negative temperature coefficient of resistance behaviour up to 400 degrees C and above 400 degrees C. With the increase of temperature, decreased radii and displaced centres of semicircles from the real axis of impedance Cole-Cole plots suggested non-Debye type relaxation mechanism. Three dielectric relaxation regions: within (i) grain, (ii) grain-grain boundary and (iii) grain boundary were prominent in lower, middle and high temperature regions, respectively. The activation energy ranging from similar to 0.79 to 1.2 eV, suggested that the conduction carriers were cation and cation, oxygen vacancies in lower and higher temperature regions, respectively.

引用

页码：58 / 65

页数：8

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