IMPEDANCE AND MODULUS SPECTROSCOPY CHARACTERIZATION OF SODIUM-BISMUTH TITANATE-BASED LEAD-FREE FERROELECTRIC MATERIALS

• DOI: 10.1142/s2010135x12500026
• Publication Date: 2012-02-28T11:37:58Z
• Authors: DHANANJAY K. SHARMA; RAJU KUMAR; RADHESHYAM RAI; SEEMA SHARMA; ANDREI L. KHOLKIN
• Keywords: Bismuth; Atmospheric temperature range; Bismuth titanate

In this paper, we present impedance spectroscopy of Sodium Bismuth Titanate-based materials belonging to (1-x) Na 1/2 Bi TiO 3-x BaTiO 3 (x = 0.04) (NBT–BT) system. NBT–BT ceramics are prepared by high temperature solid-state reaction method. X-ray diffraction technique showed single-phase polycrystalline sample with an ABO perovskite structure. Dielectric behavior and the relaxation were investigated in a wide range (room (RT) –500°C) frequency (1 kHz–1 MHz). A broad dielectric constant peak was observed over around phase transition temperature. The complex plot exhibited one semicircle identified 1 MHz, which is explained grain effect bulk. centers semicircles lie below real axis, indicates that response Cole–Cole type relaxation.