Improved dielectric properties and grain boundary response in neodymium-doped Y2/3Cu3Ti4O12 ceramics

JOURNAL OF ALLOYS AND COMPOUNDS

卷:678

Article

Liang, Pengfei¹  Yang, Zupei¹  Chao, Xiaolian¹ 

[1] Shaanxi Normal Univ, Sch Mat Sci & Engn, Key Lab Macromol Sci Shaanxi Prov, Xian 710062, Shaanxi, Peoples R China

关键词: Giant permittivity;    Low dielectric loss;    Grain boundary response;    Dielectric properties;    Electrical conductivity;    Electrical modulus;   

DOI  :  10.1016/j.jallcom.2016.03.294

来源: Elsevier

【 摘 要 】

Rare earth element neodymium was adopted to refine grain and in turn increase the volume of grain boundary of Y2/3Cu3Ti4O12 ceramics, which could strongly increase the resistance of grain boundary. Proper amount of Nd substitution in Y2/3-xNdxCu3Ti4O12 ceramics could significantly depress the low-frequency dielectric loss. When the doping level is 0.06 and 0.09, the samples exhibited a relatively low dielectric loss (below 0.050 between 0.3 and 50 kHz) and high dielectric constant above 11000 over a wide frequency range from 40 Hz to 100 kHz. Based on the epsilon'-T plots, dielectric relaxation intensity was substantially weakened by Nd doping so that the temperature stability of dielectric constant was improved obviously. The correlations between low-frequency dielectric loss and the resistance of grain boundary were revealed. After Nd doping, the activation energies for the conduction behavior in grain boundaries were significantly enhanced, and the activation energies for the dielectric relaxation process in grain boundaries were slightly influenced. (C) 2016 Elsevier B.V. All rights reserved.

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