Molten-salt synthesis of BaTiO3 powders and their atomic-scale structural characterization
Molten-salt synthesis of BaTiO3 powders and their atomic-scale structural characterization
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DOI：
10.1016/j.jallcom.2016.11.395
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发表时间：
2017-02
影响因子：
6.2
通讯作者：
P. Xue;Yang Hu;Weiren Xia;Heng Wu;Xinhua Zhu
中科院分区：
文献类型：
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作者：
P. Xue;Yang Hu;Weiren Xia;Heng Wu;Xinhua Zhu
以BaCO 3、TiO 2和共晶盐（NaCl-KCl）为原料，采用熔盐法合成BaTiO 3粉体。本文系统地研究了BaCO_3-TiO_2混合盐中NaCl与KCl的摩尔比以及煅烧温度对BaTiO_3粉末微观结构的影响。X射线衍射和拉曼光谱结果表明，所制备的粉体均为四方晶系钙钛矿结构。随着煅烧温度的升高，所制备的BaTiO 3粉体的形貌由长方形/球形聚集体向圆形或立方体形发展，平均粒径也由320 nm增大到900 nm。随着BaCO 3：TiO 2：NaCl：KCl摩尔比的增加，BaTiO 3粉体的平均粒径由440 nm减小到360 nm，形貌由长方体和立方体向球形转变。用X射线能谱分析法对合成的BaTiO_3粉体进行了化学成分分析，结果表明，合成的BaTiO_3粉体的化学成分与标称配比一致。本研究结果为大规模合成具有可控尺寸和形状的其他钙钛矿过渡金属氧化物粉末提供了一种通用方法。
In this work, BaTiO3powders were synthesized by molten-salt synthesis method using BaCO3,TiO2, and the eutectic salts (NaCl-KCl) as the raw materials. A systematic study indicating the effects of calcination temperature as well as the molar ratio of NaCl to KCl in the mixed salt with respect to BaCO3-TiO2on the microstructures of BaTiO3powders is reported. The results showed that all the powders crystallized in a tetragonal perovskite structure, as confirmed by X-ray diffraction pattern and Raman spectra. With increasing the calcination temperature, the morphology of the as-prepared BaTiO3powders developed from rectangular/spherical aggregates to circular or cubic shapes and the average particle size was also increased from 320 nm to 900 nm. With increasing the molar ratio of BaCO3:TiO2: NaCl: KCl, the average particle size was slightly decreased from 440 nm to 360 nm, and the morphology of the as-synthesized BaTiO3powders transformed from rectangular and cubic shapes to sphere shapes. The chemical compositions of the as-synthesized BaTiO3powders obtained from energy dispersive X-ray analysis are in agreement with the nominal ratios. The present results provide a generalized methodology to large-scale synthesize other perovskite transitional metal oxide powders with controllable sizes and shapes.