Citation: ZHAN Hong-Quan, JIANG Xiang-Ping, LI Xiao-Hong, ZHU Mian-Xia, LUO Zhi-Yun. Formation Mechanisms of Monodisperse Strontium Titanate Nanocrystalline[J]. Chinese Journal of Inorganic Chemistry, ;2015, (5): 888-894. doi: 10.11862/CJIC.2015.137 shu

Formation Mechanisms of Monodisperse Strontium Titanate Nanocrystalline

1.
Department of Material Science and Engineering, Jingdezhen Ceramic Institute, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen, Jiangxi 333403

Corresponding author: ZHAN Hong-Quan,
Received Date: 23 August 2014
Available Online: 16 December 2014
Fund Project: 国家自然科学基金(No.51262009) (No.51262009)江西省自然科学基金(No.20122BAB203019,20132BAB206017,20122BAB202001) (No.20122BAB203019,20132BAB206017,20122BAB202001)江西省教育厅科技项目(No.GJJ13628) (No.GJJ13628)江西省高校大学生创新创业计划项目(No.201310408019) (No.201310408019)

In the mixed-solution of ethanol and water, the monodisperse strontium titanate (STO) nanocrys-tallines were synthesized by hydrothermal method. The powder X-ray diffraction (XRD) patterns results revealed that the nanocrystallines crystallized in the cubic phase, and the crystallization of the products became more significant with the reaction continuing. The particle size of about 70 nm and cubic morphology were further evidenced by the scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The growth process of the nanocrystallines was studied by SEM, TEM, high resolution transmission electron microscopy (HRTEM) and electron diffraction(ED) spectroscopy in detail. The results have discovered that as follow: first, the nucleus of STO was produced by the diffusion reaction between the precursors; then, the nuclei orientedly attached by each other and the nanoparticle-aggregation came into being; last, the nanoparticle-aggregations were converted into the single crystallines of STO under Ostwald ripening mechanisms. The growth process of “diffusion reaction—oriented attachment—Ostwald ripening” has discovered the formation mechanism of STO nanocrystalline. The results of kinetics modeling with Johnson-Mehl-Avrami(JMA) equation show that the diffusion reaction is dominant at the early stage and the active energy is 15.79 kJ·mol^-1.
- strontium titanate;JMA equation;oriented attachment
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