利用溶胶-凝胶法(sol-gel)合成制备了PbTiO3、(Pb0.9-xLa0.1Cax)TiO3[简写为PLCT(100x)]纳米微粉,微粉平均粒径为20～40nm,利用拉曼散射和X射线衍射技术研究了不同Ca含量对PLCT(100x)纳米微粉的结构的影响,实验结果表明,PLCT(100x)纳米微粉的结构随x变化,亦即PLCT(100x)的轴比随x的增大反而减小,研究结果表明:PLCT(100x)拉曼谱的低频模可以看成是由于钙钛矿结构中A位离子Ca2+、La3+的偏离引起的,而高频模主要是TiO6八面体内部原子的相互运动造成相对位置变化,从而使八面体发生形变引起的。
Nanocrystalline (Pb0.9-xLa0.1Cax)Ti0.975O3 (PLCT) powders were prepared by the sol-gel technique. The average grain size of the powders is
from 20 to 40nm. The structure of the PLCT powders was investigated by using Raman scattering and X-ray diffraction analyses. The experimental results show that
low frequency phonon mode of PLCT (100x) Raman spectrum is attributed to the deviation of Ca2+ and La3+ in A location of the perovskite structure;
and high frequency phonon mode is attributed to the deformation of TiO6 octahedron, which is resulted by the deviation of the atoms in TiO6 octahedron from ideal position.
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