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For perovskite Pb-based ceramics, outstanding hardening piezoelectric properties can be easily induced by acceptor dopings of Fe, Mn or Cu, but in this work, completely different hardening effects are observed in Fe/Mn/Cu-doped K0.5Na0.5NbO3 ceramics. Pure K0.5Na0.5NbO3 exhibits a well-saturated single P-E loop, giving low Qm of 72. Fe2O3-doped ceramic exhibits the combined effects of dominant donor...
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