Electrical properties and relaxation behavior of Bi_0.5Na_0.5TiO₃-BaTiO₃ ceramics modified with NaNbO₃

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• 作者：Qi Xu^a ; ^b ; Michael T. Lanagan^b ; Wei Luo^b ; Lin Zhang^a ; Juan Xie^a ; Hua Hao^a ; Minghe Cao^a ; Zhonghua Yao^a ; Hanxing Liu^a ; ^{lhxhp@whut.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Bi0.5Na0.5TiO3 ; Impedance ; Electric modulus ; Relaxation ; PNRs
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：36
• 期：10
• 页码：2469-2477
• 全文大小：3068 K

文摘

Electric conduction and dielectric relaxation behavior in (1—x)(Bi_0.5Na_0.5TiO₃-BaTiO₃)-xNaNbO₃ ((1—x)(BNT–BT)–xNN) ceramics were investigated. All compositions showed negative temperature coefficient of resistance (NTCR) behavior. The bulk conductivity followed the Arrhenius law with E_a = 1.24–1.55 eV, which can be attributed to the electronic conduction. In the modulus (M′′-f) spectra, a peak and a shoulder were observed, corresponding to the bulk and polar nano regions (PNRs) response respectively. With the increase of either temperature or NN content, the shoulder gradually depressed and even disappeared. A correlation between the PNRs evolution and the relaxation behavior was constructed.