Mechanism of Aging in Polycrystalline BaTiO_3

概要

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Microscopic observation of the domain structure in polycrystalline BaTiO_3 is carried out. After the specimen is cooled down to room temperature through the Curie point the domain structure changes gradually from an initial irregular one to a final one consisting of fine stripes of 90°-domains. Such a change is named "90°-splitting." The aging of dielectric constant may be due to an increase in clamping effect by the 90°-splitting. This "90°-splitting model " may explain also the agings in dielectric loss and hysteresis loop. The dielectric constant decreases linearly with logarithm of aging time. It was shown theoretically that the displacement of a 90-wall towards the mechanically most stable position is proportional to the logarithm of time in the case of whisker crystal. The " logarithmic time dependence " of dielectric constant in polycrystalline specimen may be explained as due to the 90°-splitting which progresses at a rate proportional to logarithm of time.
社団法人日本物理学会の論文
1967-03-05