Abstract
The solid solutions of La modified xPb(Mg1/3Nb2/3)-(1−x)Pb(Zr0.55Ti 0.45 )O3 ceramic system are synthesized by columbite precursor method and characterized for phase formation, microstructure, dielectric and relaxor studies. Powder X-ray diffraction patterns indicate pseudocubic phase of compositions on PMN-PZT system phase diagram. La doping in PMN-PZT system inhibited grain growth while increasing grain size with PMN concentration. Density of the ceramics is increased to 1.5 mole% La doped PMN-PZT compositions and decreased with the increment of PMN concentration. ϵ RT and Tanδ are increased to 1.5 mole% La doped PMN-PZT compositions while ϵ Tc and T c are decreased with La modification in PMN-PZT system. Pure and La modified 0.8PMN-0.2PZT compositions have shown the most promising relaxor behavior applicable to multilayer capacitor (MLC) applications.
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