Stoichiometry of BaTiO3 nanoparticles

被引:0
作者
Jian Quan Qi
Li Sun
Peng Du
Wan Ping Chen
You Guo Xu
Long Tu Li
机构
[1] Tsinghua University,Department of Materials Sciences & Engineering, State Key Laboratory of Fine Ceramics and New Processing
[2] Wuhan University,Department of Physics
来源
Journal of Nanoparticle Research | 2010年 / 12卷
关键词
Barium titanate; Nanoparticle; Stoichiometry; Ba/Ti ratio; Synthesis; Colloids;
D O I
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中图分类号
学科分类号
摘要
Barium titanate nanoparticles with various nominal Ba/Ti ratios were prepared through direct synthesis from solution (DSS) and further annealed at different temperatures. Their deviation from stoichiometry was studied through XRD analysis, and a large deviation from stoichiometry has been observed. The grain size we studied ranges from 50 nm to 1 μm. For the as-prepared particles, the grain size is about 50 nm, and the maximum excess of Ti is over 15%. For the samples annealed at 800 °C, the grain size is increased to 100 nm, and the maximum excesses of Ba and Ti are 8 and 9%, respectively. The defects formed during synthesis and surface effect of nanoparticles are both estimated for their contributions to the deviation from stoichiometry, and the defects have been found to be mainly responsible for the large deviation observed.
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页码:2605 / 2609
页数:4
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[21]  
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Jean V(undefined)Preparation of nanoscaled BaTiO undefined undefined undefined-undefined
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Bernard T(undefined)Direct large-scale synthesis of Perovskite barium strontium titanate nano-particles from solutions undefined undefined undefined-undefined
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Chen WP(undefined)Phase equilibria in the system BaO–TiO undefined undefined undefined-undefined
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Zhang ZT(undefined)Abnormal grain growth kinetics of BaTiO undefined undefined undefined-undefined