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Effect of Two‐Dimensional Pressure on the Permittivity of Fine‐ and Coarse‐Grained Barium Titanate
Author(s) -
BUESSEM W. R.,
CROSS L. E.,
GOSWAMI A. K.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04363.x
Subject(s) - permittivity , barium titanate , materials science , grain size , relative permittivity , ceramic , compression (physics) , composite material , mineralogy , dielectric , chemistry , optoelectronics
The effect of two‐dimensional pressure on the permittivity of fine‐and coarse‐grained ceramic BaTiO 3 was investigated. It was shown that, unlike coarse‐grained (10μ or above) barium titanate, the permittivity of the fine‐grained (1μ mean) material increased with the increase in two‐dimensional compression perpendicular to the electrode, whereas for an intermediate grain size, the permittivity was almost independent of pressure. The apparent anomalous effect of the fine grain size on the pressure coefficient of permittivity was explained satisfactorily on the basis of an internal stress model using a modified Devonshire thermodynamic treatment.