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Aging of the Weak‐Field Dielectric Response in Fine‐ and Coarse‐Grain Ceramic BaTiO 3
Author(s) -
Wu Kaiwen,
Schulze Walter A.
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.tb04439.x
Subject(s) - materials science , dielectric , ceramic , grain size , composite material , barium titanate , sintering , accelerated aging , optoelectronics
BaTiO 3 ceramics with grain sizes of 0.6 to 6 mm and relative densities of 89% to 92% were prepared by hot forging and conventional sintering from high‐purity oxalate‐derived powder. The aging of both the dielectric constant and the dielectric loss was examined with respect to grain size, temperature, and frequency. It is suggested that the main aging mechanism in coarse‐grained BaTiO 3 is the aging of hysteretic domain wall motion. The dielectric aging is a thermally activated process and shows two aging rates when observed at a temperature of 8°C for coarse‐grained ceramics.