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Ba(Ti,Zr)O3-BiFeO3 复合陶瓷的制备与电学性能研究
Thesis Advisor徐金宝
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Name硕士
Degree Discipline材料工程
Keyword锆钛酸钡 铁酸铋 陶瓷 介电性能 压电性能


Other Abstract

Barium titanate ceramics are a kind of new functional ceramics and have been developed over the last decades. Because of their extraordinary piezoelectric and ferroelectric properties, barium titanate-based materials have been extensively studied and became one of the most important functional ceramics. In the recent years, the research on barium zirconate titanate was paid much attention because that Zr4+ is much more stable than Ti4+. Moreover, barium zirconate titanate also possesses fascinating electric properties and broad application prospect.   Bismuth ferrite (BiFeO3) is a perovskite-type single phase multiferroic materials that simultaneously show ferroelastic, ferroelectric and antiferromagnetic properties at room temperature. Because of its outstanding multiferroic properties and composite modification features, BiFeO3 has attracted broad interests and became one of the most studied modified materials. The microstructure and electrical properties of Ba(Ti,Zr)O3-BiFeO3 composite ceramics prepared by the solid-state reaction technique were investigated systemically. The influence of microstructure, morphology, ferroelectric phase transition, dielectric and piezoelectric properties of Ba(Ti,Zr)O3-BiFeO3 composite ceramics with the amount of BiFeO3 were well discussed. X-ray diffraction analyses show that BiFeO3 diffused into the lattice of Ba(Ti,Zr)O3 to form a solid solution with perovskite structure. SEM patterns show that all of the Ba(Ti,Zr)O3-BiFeO3 ceramics exhibit dense microstructures and clear grain boundaries with no pores. Piezoelectric coefficient, dielectric constant and the Curie temperature of the composites ceramics decreased with an increase in BiFeO3 content. An evident composition-induced diffuse and relaxor character is observed in the Ba(Ti,Zr)O3-BiFeO3 ceramics. The structure-property relationship and the mechanism associated with the changes in the electric properties are discussed intensively.

Document Type学位论文
Recommended Citation
GB/T 7714
张家齐. Ba(Ti,Zr)O3-BiFeO3 复合陶瓷的制备与电学性能研究[D]. 北京. 中国科学院大学,2014.
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