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固相反应法研究BaTiO3粉末的相变和微观结构的转变
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深圳市第三代半导体重点实验室


Investigation of the Phase and Microstructural Transformation on BaTiO3 Powder by Solid-State Reaction
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1.Shenzhen Key Laboratory of the Third Generation Semi-conductor,the Department of Electrical and Electronic Engineering,Southern University of Science and Technology;2.Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology

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    摘要:

    以国产亚微米级BaCO3和TiO2为原料,采用砂磨固相法合成尺寸小、四方性高的BaTiO3粉体,同时研究煅烧温度、升温速率及保温时间对BaTiO3平均粒径和四方性的影响。结果表明,通过固相反应合成BaTiO3的反应机理可分为两个阶段：当煅烧温度低于900 oC,BaCO3和TiO2首先形成立方相的BaTiO3,当煅烧温度升至900 oC,立方相BaTiO3开始向四方相转变。在煅烧温度为900 oC,升温速率为5 oC/分钟,保温5 h,制备出粒径为180.7 nm,四方性为1.0086的超细BaTiO3粉体。该工作为制备超薄层MLCC用高性能BaTiO3粉体提供了较好的研究思路。

    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.

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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,2020,49(2):476~481.[HU Qiaoyu, HUANG Hao, WEN Jiaxin, ZHANG Lei, 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.]
DOI：10.12442/j. issn.1002-185X. QH20190055

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  • 收稿日期:2019-04-09
  • 最后修改日期:2019-05-26
  • 录用日期:2019-10-23
  • 在线发布日期: 2020-03-12

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