First principal study of conduction mechanism of Mg doped BaCoO2.6 nanoparticles

Abstract

In this study, Mg-doped BaCoO_2.6 (Ba_1-xMg_xCoO_2.6) (x = 0.1 – 0.4) compounds were synthesized via Sol-gel method and their frequency and temperature-depended electrical properties were investigated in the temperature range $37°C$–$200°C$ using an impedance analyzer. Structural and chemical analysis of Mg-doped BaCoO_2.6 were carried out via scanning electron microscope (SEM-EDAX) and Fourier transform infrared spectroscopy (FTIR). The imaginary part of impedance as a function of frequency shows Debye-like relaxation. Impedance data is presented in the Nyquist plot, and the argand diagram with the grain, grain-boundary, and electrode contributions is estimated. The activation energies for the ac conductivity decrease with the frequency rise. The shifting of modulus peaks to low-frequency region suggests long-range motion and the presence of two peaks at 473 K to both long and short-range motion with more than one relaxation time. Our research being the first to report on dielectric studies, we suggest the sample’s use as serial nano-capacitors and in optical, microwave devices.