Abstract
The effect of LiNbO 3 and KNbO 3 seeds on the microstructure and dielectric characteristics of PMN ceramic prepared by columbite route have been investigated with the addition of 0, 1, and 2-wt% of seeds. X-ray diffraction, Scanning Electron Microscopy and an impedance analyzer were used to characterize the influence of seeds on physical characteristics and dielectric properties of PMN. LiNbO 3 -seeded PMN samples present a significant increase in the amount of perovskite phase. The addition of LiNbO 3 seeds in sintered PMN ceramics at 1100@C during 4 h causes a decrease in the porosity and the amount of pyrochlore phase. Weight losses during sintering of PMN ceramics are suppressed more significantly for LiNbO 3 -seeded PMN. T m of PMN ceramics changes with seeds concentration. KNbO 3 seeds displace T m to lower temperature whereas LiNbO 3 causes its elevation. Dielectric constants of approximately 13,000 at 1 kHz was measured at m 5°C in PMN ceramics with 1-wt% of LiNbO 3 seeds.
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