Synthesis and Structural Tuning of Rare-Earth Doped Lead Zirconate Titanate (PZT) Ceramics for Enhanced Ferroelectric Properties
Keywords:
Lead zirconate titanate, Rare-earth doping, lanthanum-doped PZT, morphotropic phase boundary, ferroelectric ceramics, X-ray diffractionAbstract
Lead Zirconate Titanate (PZT), being one of the most investigated ferroelectric ceramics, has attracted much attention because of its superior dielectric, piezoelectric, and electromechanical properties, especially around the Morphotropic Phase Boundary (MPB). In practical applications, however, long-term performance capabilities of doped PZT ceramics are generally limited because of their susceptibility to degradation caused by electrical fatigue, aging, evaporation of lead, or thermal instability. In this investigation, research on the structural and ferroelectric characteristics of rare earth-doped PZT ceramics was focused, specifically on lanthanum-doped PZT ceramics, substituted by 2 mol% lanthanum, doped on the composition located at/around the MPB. The PZT ceramics studied were prepared through sol-gel processing. Structural analyses were undertaken, and structural characterization was accomplished through X-ray diffraction (XRD) measurements. The diffraction data revealed that there was single-phase perovskite formation without secondary phases. The addition of lanthanum resulted in broader peaks and reduced intensity, reflecting lattice distortion and reduction in crystallites. The results prove that the doping of rare-earth elements is an effective method for carrying out controlled structural modifications of PZT ceramics for use in advanced ferroelectric devices.
