Abstract
Abstract The temperature dependence of piezoelectric properties in the PMN–PT relaxor ferroelectric system with MnO 2 addition was studied in the temperature range from −40 to 30°C. Samples were poled at −40°C and the piezoelectric properties were measured by resonance–antiresonance method. Q m increased by increasing the doping contents of Mn. When 0.5 wt.% MnO 2 was doped, Q m increased from 95 to 480. From the experimental results, it is predicted that Mn behaves as an acceptor and a domain pinning element. The effects of MnO 2 observed in PZT-based normal ferroelectrics were also confirmed in PMN-based relaxor ferroelectrics.
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