Space-charge relaxation and electrical conduction in K0.5Na0.5NbO3 at high temperatures

被引：121

作者：

Liu, Laijun ^{[1
]}

Huang, Yanmin ^{[1
]}

Su, Congxue ^{[1
]}

Fang, Liang ^{[1
]}

Wu, Meixia ^{[1
]}

Hu, Changzheng ^{[1
]}

Fan, Huiqing ^{[2
]}

机构：

[1] Guilin Univ Technol, State Key Lab Breeding Base Nonferrous Met & Spec, Key Lab New Proc Technol Nonferrous Met & Mat, Minist Educ,Coll Mat Sci & Engn, Guilin 541004, Peoples R China

[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2011年 / 104卷 / 04期

关键词：

FERROELECTRIC CERAMICS; DIELECTRIC-PROPERTIES; TITANATE; NIOBATE; PERMITTIVITY; TRANSPORT; BEHAVIOR; DEFECTS; BULK;

D O I：

10.1007/s00339-011-6358-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Sodium potassium niobate K0.5Na0.5NbO3(KNN) ceramic was synthesized by a solid-state technique. The X-ray diffraction of the sample at room temperature showed a monoclinic phase. The real part (epsilon') and imaginary part (epsilon aEuro(3)) of dielectric permittivity of the sample were measured in a frequency range from 40 Hz to 1 MHz and in a temperature range from 350 to 850 K. The epsilon' deviated from Curie-Weiss law above 702 K, due to additional dielectric contributions resulting from universal dielectric response and thermally activated space charges at high temperatures. This anomaly arose from a Debye dielectric dispersion that slowed down following an Arrhenius law. We have established a link between the dielectric relaxation and the conductivity.

引用

页码：1047 / 1051

页数：5

共 42 条

[1] LATTICE-PARAMETERS AND TILTED OCTAHEDRA IN SODIUM-POTASSIUM NIOBATE SOLID-SOLUTIONS [J].