Effect of CeO2 on dielectric, ferroelectric and piezoelectric properties of PMN–PT (67/33) compositions
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Lead magnesium niobate–lead titanate [Pb(Mg1/3Nb2/3)O3–PbTiO3] powders doped with different mole % of CeO2 were prepared by a modified columbite route with compositions corresponding to morphotropic phase boundary (MPB) region. These powders were calcined at 800 °C for 4 h and circular test specimens were prepared by uniaxial pressing. The specimens were sintered at 1150 °C/2 h, poled at 2 kV/mm d.c. voltage and were characterized for dielectric, ferroelectric and piezoelectric properties. It was observed that the piezoelectric and ferroelectric properties initially increase up to 2 mol% of ceria addition and then decrease with increase in ceria concentration. The diffusivity of the dielectric curves increases with increase in ceria concentration. The decrease in Curie temperature was observed from 173 °C corresponding to pure PMN–PT to a temperature of 138 °C for 10 mol% of ceria addition.
KeywordsCeria CeO2 BaTiO3 Piezoelectric Property Morphotropic Phase Boundary
The authors are very grateful to Dr. S. Usha Devi for XRD patterns, Mr. M.A. Venkatswami and Mrs. Kalavati for SEM. The authors also gratefully acknowledge Head, Materials Science Division and Director, NAL for providing necessary encouragement during the course of this study. The authors would like to thank Prof. V. Subramanian and D. Rout, Department of Physics, IIT Madras for their help in measurement of dielectric constant of the samples. Mr. Benudhar Sahoo also thanks CSIR, New Delhi for the research fellowship.
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