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--铁电正交相变消失，即抑制了其正交相的形成.
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 showthat 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.
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