Grain Growth Kinetics of BaTiO3 Nanocrystallines prepared by Sol-Gel method
Relative homogeneous distribution spheroidal nanocrystallines of BaTiO3 were obtained through the sol-gel process with the barium acetate (Ba(CH3COO)2), tetrabutyl titanate (Ti(OC4H9)4) as raw materials. The precursor xerogels were characterized using Thermogravimetric/ Differential Scanning Calorimetry (TG/DSC). The sample microstructure was examined by X-ray diffraction (XRD) and transmission electron microscope (TEM). The mean sizes of BaTiO3 nanocrystallines were calculated from the Scherrer formula by using the data of (101) diffraction peak of X-ray absorption spectroscopy. Applied the convention grain growth model to analyses the grain growth behavior of nanocrystalline BaTiO3 and obtained the grain growth exponent is 7, the grain growth activation energy is 75.49kJ/mol. A new isothermal model of grain growth was proposed for the BaTiO3 nanocrystallines, in which the grain growth rate constant k is assumed to be affected by both diffusion and reactivity factors. The results indicated that the proposed model is superior to the conventional model in correlating experimental data. The mixing activation energy is 27.23kJ/mol.
BaTiO3 nanocrystalline Sol-Gel method calcination grain growth kinetics
宋晓岚 何希 李宇焜 杨海平 邱冠周
中南大学 资源加工与生物工程学院 无机材料系,湖南 长沙,410083
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）