Studies on structural, dielectric behavior, and electrical properties of BiBaNiNbO6 double perovskite for electronic applications

The structural, morphological, dielectric and electrical properties for BiBaNiNbO6 sample prepared by sol–gel method have been investigated in this work. X-ray investigation confirms the formation of single phase with rhombohedral crystal structure with space group R3¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\overline{3 }$$\end{document}C at room temperature. Energy dispersion spectroscopy (EDS) analysis and scanning electron microscopy were used to confirm the chemical make-up of the synthesized molecule and the morphology of the grain size (SEM). The Z″(f) curve confirms the appearance of a relaxation phenomenon in the sample which exhibits semiconductor behavior. An electrical circuit consisting of a link of grain and grain boundary elements is used to analyze the Nyquist plots between the ranges of 200 and 360 K and 100 Hz and 1 MHz, respectively. The variation of electrical conductivity at various temperatures obeys the Jonscher’s power law. The Non-overlapping Small Polaron Tunneling (NSPT) is the appropriate model to explain the conduction mechanism for the sample. The estimated activation energies from the DC conductivity and electrical impedance are close implying that the relaxation and conduction processes are caused by the same type of charge carriers. Electrical and optical properties show higher electrical resistivity and considerable visible light absorption which makes the prepared BiBaNiNbO6 double perovskite suitable candidate for electrical applications.