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The effect of (W/Nb) co-doping at the B-site on the properties of Na0.5Bi4.5Ti4O15–based ceramics was systematically investigated in first. The distortion of lattice caused by B-site substitution improved piezoelectric activity greatly. With the introduction of W/Nb doping, these activation energy parameters indicate the existence of the p-type electrical conductivity and the oxygen vacancies motion...
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