Synthesis, dielectric, and hysteresis behaviour of Ba(Nb0.2Ti0.8)O-3 ceramics and their solid solutions with BaZrO3

Abstract

Solid state reaction technique was employed to synthesize Ba(Nb0.2Ti0.8)O-3 [BNT], and 0.9Ba(Nb0.2Ti0.8)O-3 + 0.1BaZrO(3) [BNT + BZ] samples. Sintered pellets were investigated for its dielectric (epsilon(r) and tan delta) properties in the temperature range 100 K-380 K and in the frequency range of 100 Hz-1 MHz. The variation of epsilon(r) and tan delta may be attributed to hopping of trapped charge carriers, which resulted in an extra dielectric response in addition to the dipole response. Hysteresis loop measurements were studied in the temperature regime 295 K-423 K. Loop area shrunk with the increase of temperature that may be due to phase transition from ferroelectric to paraelectric state.