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microscopic origin and relevant grain size effect of discontinuous grain growth in BaTiO_(3)-based ferroelectric ceramics

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Journal of Materials Science & Technology 2023年第33期164卷 119-128页

作者： Hong Li Bo Wu Cong Lin Xiao Wu Tengfei Lin Min Gao Hong Tao Wenjuan Wu Chunlin Zhao College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China Physics Department Southwest Minzu UniversityChengdu 610041China Sichuan Province Key Laboratory of Information Materials and Devices Application Chengdu University of Information TechnologyChengdu 610225China

Barium titanate[BaTiO_(3)(BT)]-based ceramics are typical ferroelectric ***,the discontinuous grain growth(DGG)and relevant grain size effect are deeply *** obvious DGG phenomenon is observed in a paradigmatic Zr^(4+)-doped BT-based ceramic,with grains growing from∼2.2–6.6 to∼121.8–198.4μm discontinuously near 1320℃.It is found that fine grains can get together and grow into large ones with liquid phase surrounding them above eutectic *** the grain boundary density(D g)is quantitatively studied and shows a first-order reciprocal relationship with grain size,and the grain size effect is dependent on D *** grains lead to high D g,and then cause fine domains and pseudocubic-like phase structure because of the interrupted long-range ferroelectric orders by grain *** D g also causes the diffusion phase transition and low Curie dielectric peak due to the distribution of phase transition temperature induced by internal *** domain switching experiments reveal that the polarization orientation is more difficult near the grain boundary,implying that the grain boundary inhibition dominates the process of polarization orientation in fine-grain ceramics,which leads to low polarization but a high coercive ***,large-grain ceramics exhibit easy domain switching and high&similar *** work reveals that the grain boundary effect dominates the grain size effect in fine-grain ceramics,and expands current knowledge on DGG and grain size effect in polycrystalline materials.

关键词： BT-based ferroelectric ceramics Discontinuous grain growth Grain boundary density Grain size effect on structure/property microscopic origin

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