Piezoelectric, impedance, electric modulus and AC conductivity studies on (Bi0.5Na0.5)0.95Ba0.05TiO3 ceramic

摘要: Lead-free piezoelectric perovskite ceramic (Bi 0.5 Na ) 0.95 Ba 0.05 TiO 3 (BNT-BT ), prepared by conventional high temperature solid state reaction technique at 1160 °C/3h in air atmosphere, is investigated impedance and modulus spectroscopy a range 35–400 °C, over frequency 100 Hz–1 MHz. The crystal structure, microstructure, properties as well the AC conductivity of sample were studied. Powder X-ray diffraction pattern derived from resulting data room subjected to Rietveld refinements Williamson-Hall plot analysis confirmed formation phase pure compound with monoclinic unit cells having crystallite-size ~33.8 nm. Observed SEM micrograph showed uniform distribution grains inside an average grain size ~3 mm. Longitudinal charge coefficient poled under DC electric field ~ 2.5 kV/mm 80 °C silicone oil bath was found be equal 95 pC/N. dependent electrical analysed framework conductivity, complex formalisms negative resistance (NTCR) character material dielectric relaxation non-Debye type. Double power law for frequency-dependence Jump Relaxation Model (JRM) explain successfully mechanism transport BNT-BT .