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胡乔宇,黄皓,温佳鑫,张蕾,于洪宇.固相反应法研究BaTiO3粉末的相变和微观结构的转变[J].稀有金属材料与工程(英文),2020,49(2):476~481.[HU Qiaoyu,HUANG Hao,WEN Jiaxin,ZHANG Lei and YU Hongyu.Investigation of the Phase and Microstructural Transformation on BaTiO3 Powder by Solid-State Reaction[J].Rare Metal Materials and Engineering,2020,49(2):476~481.]
Investigation of the Phase and Microstructural Transformation on BaTiO3 Powder by Solid-State Reaction
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Received:April 09, 2019  Revised:May 26, 2019
DOI:
Key words: Barium titanate  Solid state reaction  Phase transformation  Microstructure
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HU Qiaoyu,HUANG Hao,WEN Jiaxin,ZHANG Lei and YU Hongyu  
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Abstract:
      As the miniaturization of multilayer ceramic capacitors (MLCCs) is a major trend, well-fabricated ferroelectric materials such as barium titanate (BaTiO3, BTO) with small grain and well crystallinity are increasingly in demand. Compared with other synthetic routes, solid-state reaction (SSR) is a more feasible route to prepare BaTiO3 nanoparticles without lattice imperfections. In contrast to other researches about SSR that mainly focus on exploring improved processes to obtain BaTiO3 nanoparticles with high tetragonality, investigations on the phase, microstructural transformation and reaction mechanism of BaTiO3 nanoparticles were made in this study. Experiments results reveal that the reaction mechanism of forming tetragonal BaTiO3 via SSR can be ascribed to two main reaction stages, including the formation of cubic BaTiO3 and the cubic-tetragonal transformation of BaTiO3. Finally, BaTiO3 powders with a tetragonality of 1.0086 (c/a) and average particle size of 180 nm was acquired after optimizing the calcination parameters.