Dielectric, ferroelectric and pyroelectric properties of PMNT ceramics

In the present study, different PMNT samples in the MPB range were prepared in single perovskite phase using Columbite technique. After poling, dielectric constant (epsilon(r)) of PMNT 70/30 samples decreases and of PMNT 68/32 and PMNT 66/34 samples increases. Polarization vs. electric field (P-E) hysteresis loops of PMNT samples show their ferroelectric nature. Transition temperature (TC) obtained from pyroelectric coefficient (p(i)) variation with temperature increases with the increase in PT content in PMNT samples near MPB and agrees with T-c obtained from the dielectric study. (c) 2005 Elsevier B.V. All rights reserved.