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Effect of grain size and mechanical processing on the dielectric properties of BaTiO3

Published online by Cambridge University Press:  03 March 2011

B.W. Lee  and
K.H. Auh
B.W. Lee*
Affiliation:
Department of Inorganic Materials Engineering and CMI, Hanyang University, Seoul 133–791, Korea
K.H. Auh
Affiliation:
Department of Inorganic Materials Engineering and CMI, Hanyang University, Seoul 133–791, Korea
*
a)Present address: Department of Materials Engineering, Korea Maritime University, Pusan 606–791, Korea.
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Abstract

Dielectric properties of polycrystalline BaTiO3 ceramics having grain sizes of 1 to 40 μm have been studied. Fine-grained ceramic BaTiO3 of 1 μm average grain size has 90°domains and has shown higher dielectric constant, lower ferroelectric transition temperature (Tc), and lower transition energy than coarser-grained material. 90°domain switching was preferentially produced in the fine-grained BaTiO3 as a result of abrasion. For the fine-grained BaTiO3, the dielectric constant decreased with one-dimensional pressure, whereas, for the coarse-grained material, the dielectric constant increased before decreasing with the pressure. The one-dimensional pressure resulted in increased Tc of both the fine- and coarse-grained BaTiO3, with the effect being the greatest for the coarse-grained material. The relationship between these results and internal stress, and the effect of external pressure imposed on internally stressed lattice, were discussed.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 6 , June 1995 , pp. 1418 - 1423
Copyright
Copyright © Materials Research Society 1995

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References

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