The effects of particle sizes on crystal structure and diffusivity in 0.95(Na0.5K0.5) NbO3-0.05BaTiO3 ceramics

초록

We prepared powders with different particle sizes using various secondary milling times to fabricate 0.95(Na0.5K0.5)NbO3- 0.05BaTiO3 (0.95NKN-0.05BT) by the conventional solid-state reaction. As secondary milling time of the powders was changed from 0 to 72 hours, the particle sizes of the powder with composition of 0.95NKN-0.05BT were significantly decreased from 14 mu m to submicron. As a results, the tetragonality (c/a) and the Curie temperatures (TC) was slightly increased. The diffusivities(gamma) of 0.95NKN-0.05BT ceramics were sharply decreased when the particle sizes of powders with composition of 0.95NKN-0.05BT were decreased from 14 mu m to submicron. The phase transition characteristic of 0.95NKN-0.05BT ceramics shifted from relaxor-like ferroelectric to a normal ferroelectric as particle size of powder decreased from several micrometer to submicron in 0.95NKN-0.05BT ceramics.

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