Abstract
The objective of this study is to fabricate a piezoelectric composite consisting of a piezoelectric ceramic and a high toughness material and to evaluate their electromechanical properties for high force actuator applications. The mixture of the piezoelectric material, PMNZT, and high toughness material, ZrO 2 , exhibited high piezoelectric properties as well as good mechanical fracture resistance. Up to 2 vol% of ZrO 2 in PMNZT matrix, piezoelectric d 33 coefficient was above 400 pC/N, being 80% of that for the original PMNZT, and the toughness showed twice of the PMNZT. When the volume fraction of the ZrO 2 was above 5%, however, the piezoelectric coefficient became abruptly decreased and it approached 20% of value for the PMNZT. The change in piezoelectric and mechanical properties with respect to the fraction of the ZrO 2 was evaluated via a model proposed by ferroelectrics.
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