Ferroelectric-to-relaxor crossover in Sb doped PLZT x/52/48 (2 ≤ x ≤ 16) piezoelectric ceramics

Dielectric behavior and diffuse phase transition have been investigated in Sb doped lead lanthanum zirconate titanate (PLZT) ceramics to understand the role of La and Sb in ferroelectric-to-relaxor crossover. Rayleigh and Curie–Weiss type law fittings show that the La substitution gradually transforms the PLZTs from ferroelectric to relaxor, while Sb dopants weaken the diffuseness and dielectric dispersion. Vogel–Fulcher model reveals that the samples at high La concentration are fully in relaxor state comparable to the undoped PLZTs.