Structural, optical, and dielectric properties of double perovskite NdBaFeTiO6

Abstract

NdBaFeTiO6 compound was synthesized successfully through solid-state reaction method. The compound was found to have a crystalline cubic double perovskite (DP) structure with space group Pm-3m by XRD analysis. Structural refinement was performed to investigate the detail of the structure and was found consistent with the experimental results. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and elemental mapping were used to analyze the morphology and elemental composition, revealing the existence of expected chemical composition and uniform distribution of elements within the material. FTIR and Raman spectroscopic techniques were utilized to investigate the vibrational modes and bonding configurations present in the synthesized sample. XPS spectra confirms the existence of photoelectron peaks associated with constituent elements, and also reveals the lattice oxygen and oxygen vacancies. Optical absorbance measurements showed that this material possesses a significant band gap energy of around 4eV, making it a promising candidate for a variety of technological applications. The electrical properties of this double perovskite were investigated using dielectric measurements, both frequency and temperature dependent. At low temperatures, the dielectric constant behaves independently. At higher temperatures, the thermal energy sufficiently enhances the mobility of charge carriers, thereby causing an elevation in dielectric constant of the order of 104 and 103 at low and high frequencies respectively. Moreover, the temperature dependence of the dielectric constant varies for different frequencies.