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溶胶凝胶法制备掺铅钛酸钡纳米晶及其结构相变

范仰才1; 蒋力立1; 唐新桂1; 周歧发2; 张进修2   

  1. 1. 广东工业大学应用物理系,广州 510090; 2. 中山大学物?理系,广州 510275
  • 收稿日期:1999-11-08 修回日期:2000-01-04 出版日期:2000-10-20 网络出版日期:2000-10-20

Structure Phase Transition of Nanocrystalline Barium Titanate Doped with Lead Prepared by Sol-Gel Methods

FAN Yang-Cai1; JIANG Li-Li1; TANG Xin-Gui1; ZHOU Qi-Fa2; ZHANG Jin-Xiu 2   

  1. 1.Department of Physics; Guangdong University of Technology; Guangzhou 510090; China; 2.Department of Physics; Zhongshan University; Guangzhou 510275 China
  • Received:1999-11-08 Revised:2000-01-04 Published:2000-10-20 Online:2000-10-20

摘要: 采用溶胶-凝胶工艺制备了不同晶粒大小的、掺铅(5mol%)钛酸钡(BPT)纳米晶.用TEM、XRD和DSC研究了BPT样品的晶粒大小、结构及其相变特性.结果表明,纳米晶BPT随着晶粒尺寸的减小,由铁电四方相向顺电立方相过度,并且相变变得弥散.其顺电-铁电相变随着晶粒尺寸的减小而消失.另一方面,随着晶粒尺寸的增加,其铁电四方-铁电正交相交消失,即抑制了其正交相的形成.

关键词: 溶胶-凝胶法, 纳米晶, 晶粒尺寸, 结构相变

Abstract: Nanocrystalline (Ba,Pb)TiO3 (5 mol% Pb) with various grain sizes were prepared by a sol-gel process. The gain size, structure and phase properties of nanocrystalline BPT were studied by TEM, XRD and DSC. The results show
that the structure phase transition is from ferroelectric tetragonal to paraelectric cubic phase and becomes more diffusive with decreasing particle size.
On the other hand, the ferroelectric orthorhombic to ferroelectric tetragonal phase transition disappears with increasing particle size, it means that the
formation of the unwanted orthorhombic phase of BaTiO3 is inhibited.

Key words: sol-gel method, nanocrystalline, grain size, structure phase transition

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