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Synthesis and Dielectric Properties of CaCu3Ti4O12 Doped with La3+

A.K. Thomas


The effect La3+ doping on the structural and dielectric properties of CaCu3Ti4O12 (CCTO) is investigated, resulting in a compound of the type Ca1-xLaxCu3Ti4O12 (x = 0.00, 0.20 and 0.50). The compounds have been prepared by conventional solid state reaction. The Ca1-xLaxCu3Ti4O12 ceramics were characterized by X-ray diffraction, SEM techniques. The grain size and the grain boundary resistivity increased with the increase of doping percentages. Dielectric constant of the samples decreases with increasing dopant concentrations. The dielectric behaviour of compound can be explained in terms of barrier layer capacitor mechanism.


Dielectric properties, solid state reaction, Perovskites, grain boundaries, CCTO

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