Investigation of structural and dielectric properties of (La, Fe)-doped PZT ceramics

Polycrystalline samples of iron doped lead lanthanum zirconium titanate (PLFZT) with a general formula Pb0.9(La1−yFey)0.1(Zr0.55Ti0.45)0.975O3, [y=0.0,0.3,0.5,0.7y=0.0,0.3,0.5,0.7] near the morphotropic phase boundary have been synthesized by a high-temperature, solid-state reaction technique. Preliminary X-ray structural study of the compounds show the formation of tetragonal structure. Detailed studies of dielectric constant (ε)(ε) and tangent loss (tanδ) as a function of frequency (102 Hz to 10 kHz) at room temperature (RT) and temperature (RT–350 °C) at 10 kHz suggest that compounds undergo ferroelectric–paraelectric phase transition of diffuse type. The activation energy (Ea) of the samples was calculated from the plot of AC conductivity versus inverse of absolute temperature. The temperature dependence of resistivity shows that the compounds have negative temperature coefficient of resistance.