Effect of sintering temperature on structural, dielectric, piezoelectric and ferroelectric properties of sol-gel derived BZT-BCT ceramics

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• 作者：E. Chandrakala^a ; J. Paul Praveen^a ; Binoy Krishna Hazra^b ; Dibakar Das^a ; ^{ddse@uohyd.ernet.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：A. Sintering ; B. Grain size ; Microstructure ; Dielectric ; Piezoelectricity ; Ferroelectricity
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：42
• 期：4
• 页码：4964-4977
• 全文大小：5799 K

文摘

The effects of sintering temperature on the structural, dielectric, piezoelectric and ferroelectric properties of sol–gel derived lead-free 0.5Ba(Zr_0.2Ti_0.8)O₃-0.5(Ba_0.7Ca_0.3)TiO₃ (BZT-BCT) piezoelectric ceramics have been reported in this manuscript. BZT-BCT ceramics sintered at 1550 °C for 2 h resulted in homogeneous and highly dense microstructure with ~96–97% of the theoretical density and grain size of ~10 µm. The results indicated a strong influence of the sintering temperature on the structural, dielectric, piezoelectric and ferroelectric properties of BZT-BCT ceramics. BZT-BCT ceramics sintered at 1550 °C for 2 h resulted in high piezoelectric charge coefficient d₃₃~617 pC/N, large planar electromechanical coupling factor k_p~54%, large piezoelectric voltage constant g₃₃~11.5 mV m/N, high dielectric constant ε_r~5000, and a low tan δ~0.019. The correlation of dielectric, piezoelectric and ferroelectric properties of the BZT-BCT ceramics with sintering temperature has been explained on the basis of grain size effect and motion of the 90° domain walls.