Microstructure and electrical properties of Nb and Mn co-doped CaBi₄Ti₄O₁₅ high temperature piezoceramics obtained by two-step sintering

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• 作者：Zong-Yang Shen^a ; ^b ; ^{shenzongyang@163.com" class="auth_mail" title="E-mail the corresponding author} ; Wen-Qin Luo^a ; Yanxue Tang^c ; Shujun Zhang^b ; ^{soz1@psu.edu" class="auth_mail" title="E-mail the corresponding author} ; Yueming Li^a
• 关键词：A. Sintering ; C. Piezoelectric properties ; E. Sensors
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 May 2016
• 年：2016
• 卷：42
• 期：6
• 页码：7868-7872
• 全文大小：1123 K

文摘

Bismuth layer structural ceramics with a composition of CaBi₄Ti_3.95Nb_0.05O₁₅+0.2 wt% MnO₂ (CBTN–Mn) were prepared by a two-step sintering (TSS) approach. The effect of sintering process on the microstructure and its relationship with the electrical properties of the CBTN–Mn ceramics was investigated. A dense microstructure with small and homogeneous grains was obtained under an optimized two-step sintering condition, leading to a strongly enhanced piezoelectric constant (d₃₃=27 pC/N). In addition, this ceramic also possesses high Curie temperature (T_c=790 °C), low dielectric loss (tan δ=0.2%) and high dc resistivity (ρ=5.5×10⁶ Ω cm at 500 °C), indicating its potential for high temperature piezoelectric sensing applications.