Colossal and relaxor-like dielectric behaviors in SrCrO4 ceramics

被引：8
|
作者：
Sun, J. [1 ]
Wang, S. T. [1 ]
Tong, L. [1 ]
Wang, J. [1 ]
Suhaib, S. A. [1 ]
Xie, Y. M. [1 ]
Zhu, G. B. [1 ]
Wang, C. C. [1 ]
机构：
[1] Anhui Univ, Sch Phys & Mat Sci, Lab Dielect Funct Mat, Hefei 230601, Anhui, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 764卷
基金：
中国国家自然科学基金;
关键词：
Ceramics; Dielectric properties; Defect dipole; Relaxation; X-RAY-DIFFRACTION; TEMPERATURE-RANGE; PERMITTIVITY; CONSTANT; OXIDES; COMPOSITES; STABILITY; CHROMITE; SRTIO3; LACRO3;
D O I：
10.1016/j.jallcom.2018.06.094
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ceramic SrCrO4 samples were prepared via conventional solid state reaction route. Dielectric properties of SrCrO4 were systematically investigated in the frequency range of 10(2)-10(6) Hz and temperature range of 5-900 K. Colossal dielectric behavior near room temperature and relaxor-like dielectric behavior around 730 K with an extremely high dielectric constant up to 1.62 x 10(5) were found. Dual relaxation mechanism composed of a dipolar and a Maxwell-Wagner relaxations is found to be responsible for the colossal dielectric behavior. The dipolar relaxation (R1) is related the defect dipole pair of OHo*-Cr3+ caused by chemically absorbed water. The Maxwell-Wagner relaxation (R2) results from grain boundaries. The relaxor-like dielectric behavior is associated with the hopping motion of oxygen vacancies which leads to a high-temperature relaxation (R3). (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：300 / 306
页数：7
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