自然科学研究

CaCO3掺杂对铪钛酸钡陶瓷微观结构及电学性能的影响

田兴国 (伊犁师范大学物理科学与技术学院 新疆凝聚态相变与微结构实验室), 马晓娇 (伊犁师范大学物理科学与技术学院 新疆凝聚态相变与微结构实验室), 尹红梅 (新疆大学 物理科学与技术学院), 周恒为 (伊犁师范大学物理科学与技术学院 新疆凝聚态相变与微结构实验室)

摘要


采用传统的固相反应法在1350℃制备了BaHf0.02Ti0.98O3-xCaCO3 (x = 0.005、0.02、0.05、0.07、0.1、0.15、0.2)陶瓷，通过对陶瓷的微观结构、表面形貌、介电、铁电、压电性能的测试与分析发现：所有BaHf0.02Ti0.98O3+xCaCO3陶瓷样品均呈现出钙钛矿结构的铁电体特征；室温相组成随CaCO3掺杂量的增加T相增强，低温R-O相和O-T相转变温度降低，居里温度略有升高，在x=0.2时最大，值为401K；平均晶粒尺寸均小于纯BaHf0.02Ti0.98O3陶瓷，低温烧结时CaCO3掺杂可减小陶瓷晶粒尺寸；陶瓷剩余极化强度和矫顽电场随CaCO3掺杂量的增加变化相似，均在x=0.07时达到最大值（2Pr=18.6μC/cm2和2Ec=14.5kV/cm），压电系数在x=0.005时最大，值为238pC/N。

关键词


CaCO3掺杂；微观结构；电学性能；铪钛酸钡陶瓷

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DOI: https://doi.org/10.33142/nsr.v2i1.15907

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