Raman Scattering Investigation of the Phase Transition in Nanocrystalline (Pb_(0.9-x)La_0.1Ca_x)Ti_0.975O_3 Powders
Source abstract
Abstract
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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Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · X-ray Diffraction in Crystallography · Catalytic Processes in Materials Science
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