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Impedance spectroscopy study of LaMnO_3 modified BaTiO_3 ceramics

机译:LaMnO_3改性BaTiO_3陶瓷的阻抗谱研究。

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摘要

Ba_(0.97)Ti_(0.97) La_(0.02)Mn_(0.04)O_3 nanocrystalline powder was prepared by chemical route with the help of soluble tartarate complex of Ti~(4+) ion. Preliminary X-ray diffraction analysis of crystal structure showed that a single-phase compound was formed exhibiting tetragonal system. Average crystallite size and particle size were observed to be between 27 and 33 nm, which were analyzed through XRD and transmission electron microscope respectively. Wide range impedance spectroscopy study from 200 to 600℃ showed the presence of both bulk and grain boundary effects up to 500℃. The bulk conductivity indicated an Arrhenius-type thermally activated process and oxygen vacancies are the possible ionic charge carriers at higher temperatures. The variation of ac conductivity as a function of frequency indicated the possibility of hopping mechanism for electrical process in the system with a non-exponential type of conductivity relaxation.
机译:借助Ti〜(4+)离子的可溶性酒石酸酯络合物,通过化学途径制备了Ba_(0.97)Ti_(0.97)La_(0.02)Mn_(0.04)O_3纳米晶粉。晶体结构的初步X射线衍射分析表明形成具有四方晶系的单相化合物。分别通过XRD和透射电子显微镜分析平均晶粒尺寸和粒度在27至33nm之间。从200到600℃的宽范围阻抗谱研究表明,在500℃以下都存在体和晶界效应。整体电导率表明是Arrhenius型的热活化过程,氧空位是较高温度下可能的离子电荷载体。交流电导率随频率的变化表明,在电导率松弛非指数类型的系统中,电气过程的跳变机制是可能的。

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