Abstract
Abstract The dielectric, ferroelectric and piezoelectric properties of rare-earth Nd-doped lead zinc niobate–lead titanate (Nd:PZNT) and transition metal Cr-doped lead zinc niobate–lead titanate (Cr:PZNT) single crystals have been investigated. Formation of pure perovskite phases was confirmed from powder X-ray diffraction. Lattice parameters have been obtained by Rietveld refinement. Both Nd and Cr doped crystals showed a diffuse phase transition and frequency dispersive phenomena supporting the enhancement in relaxor behavior. The variation in the values of dielectric constant ( ɛ r ), AC conductivity and piezoelectric charge coefficient ( d 33 ) due to the creation of oxygen vacancies and lead vacancies as a result of doping is investigated in detail. Hysteresis behavior of the doped crystals is explained by considering the possible switching mechanism of domains and the formation of defect dipoles.
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