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In this study, the electric‐field‐induced strain of PT‐PZ‐PMN ceramics was investigated in view of actuator applications under relatively high electric fields. The electric‐field‐induced strain was maximum at the composition x = 39.5, where x denotes the PbTiO 3 (PT) content in the formula x PbTiO 3 ·25PbZrO 3 ·(75 ‐ x )Pb(Mg 1/3 Nb 2/3 )O 3 . This composition was 2 mol% richer in PT than the composition at which the piezoelectric constant was maximum. The mechanism of electric‐field‐induced strain at the composition x = 39.5 was analyzed using in situ X‐ray diffraction (XRD) under various electric fields. No change in c / a (tetragonality) was observed. On the other hand, the diffraction intensity ratio of the (200) to (002) planes varied with the electric field. The strain value calculated from changes in the intensity ratio showed good agreement with the measured value, indicating that 90° domain switching dominated in electric‐field‐induced strain for 39.5PbTiO 3 · 25.0PbZrO 3 ·35.5Pb(Mg 1/3 Nb 2/3 )O 3 .
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Hirofumi Yamaguchi (1999) studied this question.
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