Abstract
Polycrystalline Dy -modified Pb 1-x K 2x Nb 2 O 6 (PKN) ferroelectric ceramic with a general formula Pb 1-x K 2x-3y M y Nb 2 O 6 for x=0.20, y=0.10 and M = Dy , have been prepared by the solid-state reaction route. The X-ray diffraction (XRD) studies of the material at room temperature revealed orthorhombic structure with lattice parameters a=17.701 Å, b=17.958 Å and c=3.883 Å. The dielectric anomaly with a sharp peak is observed at 430°C. The impedance plots are used as a tool to analyze the sample behavior as a function of frequency. The grain and grain boundary contributions are estimated. The modulus mechanism indicates the non-Debye type relaxation. The activation energy value near the phase transition temperature has been found to be different in the above TC from AC conductivity measurements.
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