Electrostriction in Perovskite-Type Ferroelectric Ceramics

概要

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The electrostriction and polarization in the perovskite-type ferroelectric ceramics have been calculated in the state under the arbitrary biasing field. Domain configurations produced by 180°-reversal or 90°-rotation have been represented here by the threshold angle θ_<180> or θ_<90>; that is, domains, making smaller angles than θ_<180> or θ_<90> after the switching once occurs, are completely reoriented under the given bias. The electrostriction and polarization can be calculated as functions of θ_<90> and θ_<180>, from the spontaneous strain and polarization of the crystal. The spontaneous strain in the rhombohedral crystal has been obtained from as (3/2)[(π/2)-α] for the first time. Bias dependence of θ_<90> and θ_<180> have been obtained from the experimental results and the expectation based sent calculations. Some discrepancies between the results and the expectation based on the activation field considerations are presumably due to the mechanical stress accompanied with 90°-rotations, and to the interaction of 180°-reversals and 90°-rotations.
社団法人応用物理学会の論文
1967-09-05