Barrier layer formation and PTCR effect in (1-x) Pb(Fe1/2Nb1/2)O3]-xPbTiO3 (x = 0.13) ceramics

摘要

(1-x)Pb(Fe1/2Nb1/2)O3-PbTiO3(PFN-xPT)Ceramics with x = 0.13 sintered at 1473Kshow diffuse phase transition and very high dielectric constant at lowerfrequencies.The high value of dielectric constant at lower frequencies is shownto be due to the barrier layer formation.The resistivity of the PFN-xPTceramics, obtained by complex impedance analysis, initially decreases withtemperature and then shows an upward trend beyond the ferroelectric Curie pointreminiscent of BaTiO3 based thermistors with PTCR effect.