Characterization of Ba0.9Sr0.1TiO3 prepared by low temperature chloride aqueous synthesis

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• 作者：Srimala Sreekantan ; Ahmad Fauzi Mohd Noor ; Zainal Arifin Ahmad ; Radzali Othman ; Anthony West and Derek Sinclair
• 刊名：Journal of Materials Science
• 出版年：2007
• 出版时间：April, 2007
• 年：2007
• 卷：42
• 期：7
• 页码：2492-2498
• 全文大小：296 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

Ba_0.9Sr_0.1TiO₃ powder was processed at 80°C by reacting Ti sol in aqueous solutions that contained BaCl₂, SrCl₂ and NaOH at atmospheric pressure. Well-crystallized, spherical, nanosizes powders were formed by this method. The powders were found to have a cubic structure, which was retained even after heating at 900°C. Sintering at 1400°C, led to the formation of a tetragonal structure with a secondary phase of Ba₆Ti₁₇O₄₀. Abrupt grain growth was observed at 1400°C. The electrical response of the sample sintered at 1400°C has three electrically different regions. Each region of the sample is represented by different RC element. Element 1 (R ₁ C ₁) is the most resistive and its capacitance ishigh (0.5 nFcm?1) indicating a thin region, probably the grain boundary. Element 2 (R ₂ C ₂) shows a smaller resistance value compared to element 1. The capacitance value of element 2 is temperature-dependent and displays a Curie–Weiss behaviour, indicative of a ferroelectric material above T _c. The lower capacitance of C ₂ (15 pFcm?1) indicates that it is a much thicker region than element 1 and can be assigned as a ferroelectric bulk region. Element 3 is probably an electrode effect.