Structural and dielectric properties of sol-gel prepared PZT(La, K) ferroelectric ceramics

Abstract

Polycrystalline samples of Pb 0.9(La 1− z 3 K z ) 0.1(Zr 0.53Ti 0.47) 0.975O 3 where ( z = 0.0, 0.1, 0.3, 0.5, 0.7) complex perovskite compounds (abbreviated as PLKZT) have been synthesized by sol-gel technique. Preliminary X-ray powder diffraction studies of the compounds suggest the formation of single-phase PLKZT compounds of tetragonal structure at room temperature. Detailed studies of the dielectric constant and loss of PLKZT as a function of temperature (from room temperature to 350 °C) at 10 kHz exhibit a ferroelectric phase transition of diffuse type. The transition temperature ( T c) is found to increase with increasing K concentration. Electrical resistivity and its temperature variations are measured for all these compounds.