Investigation of resistive, capacitive and conductive properties of lead-free electronic material: 0.7Bi(Fe0.98Ga0.02)O-3-0.30BaTiO(3)

摘要

The polycrystalline 0.7Bi(Fe0.98Ga0.02)O-3-0.30BaTiO(3) (BFG-BTO) ceramic was processed by high temperature reaction route. The room temperature X-ray spectra suggest a tetragonal symmetry. The structural refinement was also carried out. The high densification of sample formation is depicted from a scanning of the natural surface of the sample. The electrical properties were measured using a complex impedance method over a wide range of frequencies and temperatures. The overlapping large-polaron tunnelling model type of conduction mechanism is obtained from the frequency dependent ac conductivity plots. The relaxation mechanism is studied with the help of various spectroscopic tools (modulus and dielectric). The Nyquist plot indicates the non-Debye characteristics and the combined contribution of both grain and grain boundary towards the resistive property of the sample.