Effect of space charge on dielectric and magneto-dielectric behaviors in Ba0.85Ca0.15Zr0.1Ti0.9O3/La0.67Sr0.33MnO3 heterostructure

被引：14

作者：

Guo, S. J. ^{[1
]}

Luo, B. C. ^{[1
]}

Pei, H. Y. ^{[1
]}

Chen, C. L. ^{[1
]}

Jin, K. X. ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Key Lab Space Appl Phys & Chem, Minist Educ, Sch Sci, Xian 710072, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2018年 / 44卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Dielectric relaxation; Magneto-dielectric effect; Space charge; Ba0.85Ca0.15Zr0.1Ti0.9O3; FERROELECTRIC PROPERTIES; RELAXATION; STRAIN; PHASE; FIELD;

D O I：

10.1016/j.ceramint.2018.05.033

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The Ba0.85Ca0.15Zr0.1Ti0.9O3/La0.67Sr0.33MnO3 (BCZT/LSMO) heterostructures were deposited on LaAlO3 (111) substrates through radio-frequency magnetron sputtering technique. Dielectric behaviors as a function of frequency, temperature and magnetic field were investigated. The frequency dependence of dielectric permittivity exhibited apparent relaxation behavior. The corresponding activation energy estimated from Arrhenius plot was 2 meV. Abnormal point at 120 K was detected from the real part of dielectric permittivity vs temperature plot and magnetodielectricity (MD) vs temperature plot simultaneously, which refer to rhombohedral to orthorhombic phase transition in BCZT. A maximum of 20 percent was obtained in MD-temperature pattern, indicating obvious magneto-electric (ME) coupling. The dielectric permittivity relaxation phenomena as well as magnetodielectric effect can be ascribed to the role of space charges, which arise at interface of BCZT and LSMO owing to lattice mismatch. The dependence of magneto-dielectric on temperature results from the variation of lattice mismatch degree induced by phase transition of BCZT.

引用

页码：14286 / 14290

页数：5

共 39 条

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