Polar fluctuations in Mn substituted KTaO3 ceramics

被引：8

作者：

Axelsson, Anna-Karin ^{[1
]}

Pan, Yuya ^{[2
]}

Valant, Matjaz ^{[1
,3
]}

Vilarinho, Paula M. ^{[3
]}

Alford, Neil McN. ^{[1
,4
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

[2] London S Bank Univ, London SE1 0AA, England

[3] Univ Nova Gorica, Mat Res Lab, Nova Gorica 5000, Slovenia

[4] Univ Aveiro, CICECO, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal

来源：

JOURNAL OF APPLIED PHYSICS | 2010年 / 108卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

DIELECTRIC RESPONSE;

D O I：

10.1063/1.3481857

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Polar fluctuations were found in KTaO3 when K+ was substituted with Mn2+ on the A-site. The temperature dependence of the real part of the dielectric permittivity of (K1-2xMnx square(x))TaO3 ceramics (x=0-0.05) shows a diffuse maximum between 50-100 K in the frequency range 10(2)-10(6) Hz, shifting to higher temperature with increasing frequency and Mn content. The results are analyzed using a modified Curie-Weiss law, the Cole-Cole equation and the Arrhenius law. Here it is suggested that the observed relaxor-type dielectric behavior is attributed to the formation of electric dipoles originating from two distinct sources; one from an atomic off-center position when Mn2+ substitutes for K+ and one from the anion deficiencies formed by these aliovalent substitutions. (C) 2010 American Institute of Physics. [doi:10.1063/1.3481857]

引用

页数：6

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