An investigation of new inorganic perovskite oriented material for NTC-thermistor and other multifunctional application

Abstract

The inorganic perovskite oriented material is found to exhibit fascinating multifunctional features. Some among them were reported to exhibit multiferroic features too. In this work, a new inorganic perovskite oriented material, namely double perovskite oxide (DPO) BaCaFeVO₆ is synthesized. The structural/micro-structural investigation reveals some vital information like formation of phase, influence of different dimensional grains etc. towards the multifunctional feature. The investigating sample is found to possess dual phase: Orthorhombic (space group = Pcmn) and Trigonal (space group = R-3 m:R) with cell parameters a = 5.691Å, b = 14.684 Å, c = 5.476 Å, α = β = γ = 90⁰ and a = b = c = 7.819 Å, α = β = γ = 43.23⁰ respectively. Different oxidation states of Fe and V and its influence towards the creation of oxygen vacancies (OV) are identifies through the X-ray Photoelectron spectroscopy (XPS) analysis. The expected phase of perovskite as well as some prominent modes are identifies through Fourier transformed infrared (FTIR) and RAMAN spectroscopic analysis. The nature of the material and its response towards UV–Visible light are also investigated. Through Tauc plot, the bandgap (E_g = 3.39 eV) was extracted from the UV–Visible spectra. For storage energy oriented device application, the dielectric and related parameters were inspected through analyzing the influence of various factors like polarization, OV, grains, grain boundaries etc. in the sample. For Negative temperature coefficient (NTC)-thermistor oriented application, Thermistor coefficient (β = 5390.58 K) and sensitivity factor (α = − 2.456) were evaluated through fitting from the variation of resistance with temperature graph. The multiferroicity is clarified through the analysis of P-E and M-H hysteresis loop.