CAJ | 학술논문

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.
채용용효-응효공예제비료불동정?립대소적、참연(5mol%)태산패(BPT)납미정. 용TEM、XRD화DSC연구료BPT양품?적정립대소、결구급기상변특성. 결과표명, 납미정BPT수착정립척촌적감소, 유철전사방상향순전립방상과도，병차상변변득미산. 기순전--철전상변수착정립척촌적감소이소실. 령일방면, 수착정립척촌적증가，기철전사방--철전정교상변소실，즉억제료기정교상적형성.
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.