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Published in:
01-07-2015
Phase transition and relaxor nature of (Ba0.77Ca0.23)(Ti0.98La0.02)O3 ceramic prepared by mixed oxide route
Published in: Journal of Materials Science: Materials in Electronics | Issue 7/2015
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Abstract
In this present study, BaTiO3 is first modified with Ca2+ and then end material is modified with La3+ at the B site lattice. (Ba0.77Ca0.23)(La0.02Ti0.98)O3 ceramic was prepared by conventional mixed oxide technique. XRD analysis confirmed the formation of a single phase material of the samples calcinated at 1280 °C for 4 h. The crystal structure did not change on doping with lanthanum and it remained in cubic structure. The permittivity and dielectric loss of 0.02 mol% La doped Ba0.77Ca0.23Ti0.98O3 was improved i.e. dielectric constant was increased and dielectric loss decreased at 10 kHz after the sample had been sintered at 1360 °C for 6 h. SEM micrographs of the (Ba0.77Ca0.23)(La0.02Ti0.98)O3 sample showed that the grain size varies in the range of 100–55 nm for these samples. SEM morphology shows a uniform and very dense distribution of grains.