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The effects of rare-earth CeO2 and Sm2O3 doping on phase structure and microstructure of PNN-PZT ceramics were investigated. The results showed that appropriate amount of Ce4+ and Sm3+ were introduced into the lattice of PNN-PZT ceramics, all samples had a pure perovskite structure and existed morphotropic phase boundary (MPB). As the frequency increased from 1 kHz to 1 MHz, the dielectric constant...
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