Relaxor characteristics of highly tunable lead-free 0.5Ba(Zr_0.2Ti_0.8)O₃-0.5(Ba_0.7Ca_0.3)TiO₃ thin film grown on LaNiO₃/Si by pulsed laser deposition

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• 作者：Chandan Bhardwaj ; Davinder Kaur ; ^{dkaurfph@iitr.ernet.in}
• 关键词：Electroceramic ; Pulsed laser deposition ; Dielectric properties ; XRD
• 刊名：Current Applied Physics
• 出版年：2012
• 期刊代码：15_15671739
• 类别：ph
• 出版时间：September, 2012
• 卷：12
• 期：5
• 页码：1239-1243
• 文件大小：481 K

摘要

We report a comprehensive study on relaxor-like characteristics exhibited by (l00) oriented 0.5Ba(Zr_0.2Ti_0.8)O₃-0.5(Ba_0.7Ca_0.3)TiO₃ thin film grown on LaNiO₃ coated Si substrate by pulsed laser deposition. The diffuseness coefficient value close to 2 and excellent fit of Vogel-Fulcher curve to the experimental data, suggest its relaxor characteristics. The 鈥榖utterfly鈥?shaped dc field dependence of permittivity and evolution of P-E hysteresis loop, at different temperatures, clearly indicate the occurrence of polar nanoregions in this material. The high tunability n_r聽鈭悸?0 and low temperature coefficient TCC聽=聽5.18聽脳聽10^鈭?聽K^鈭? show that the BCZT50 ceramics could be a promising candidate for tunable capacitor applications.