Optical and transport properties of new double perovskite oxide

The ceramic material (Pb_1.5Ba_0.5BiVO₆) is prepared through usual solid state method. Its structural and transport properties are explored and a number of interesting results are found from the X-ray diffraction (XRD), scanning electron microscope (SEM), Energy dispersive X-ray spectroscopy (EDS), complex impedance spectroscopy (CIS). In Pb₂BiVO₆ the substation of ‘Ba’ at A-site also has a double perovskite structure but there is an enormous changes in its micro-structure and cell parameters. In the studied compound high emphasis has been focused on the structure, grain distribution, optical and transport properties. The room temperature XRD, SEM and FTIR study suggests that the compound is single phase new compound, uniform distribution of grains and well separated grain boundaries. SEM micrograph also suggests that the charge carriers could easily finds their path to increase the leakage current and material may to be lossy. The optical band gap of the studied compound has been calculated from UV–Vis spectroscopy analysis and the material can be useful for photovoltaic devices. The absence of any unwanted particles is shown from EDS analysis. CIS analysis of the compound suggest that the transport properties in the material are due to short range mobility as well as hopping type motion.