Studies of Optical, Dielectric, Ferroelectric, and Structural Phase Transitions in 0.9[KNbO3]-0.1 [BaNi1/2Nb1/2O3??]

The compound 0.9[KNbO3]-0.1[(BaNi1/2Nb1/2O3??] (KBNNO), a robust eco-friendly (lead-free) ferroelectric perovskite, has diverse applications in electronic and photonic devices. In this work, we report the dielectric, ferroelectric, structural phase transitions behavior KBNNO using X-ray diffraction, Raman studies at ambient as function of temperature. Analyses diffraction (XRD) data room temperature (rtp) revealed orthorhombic (sp. Gr. Amm2) with minor secondary NiO cubic Fm3m). A direct optical band gap Eg 1.66 eV was estimated rtp from UV–Vis reflectance spectrum analysis. Observation non-saturated electric polarization loops were attributed to leakage current effects pertaining oxygen vacancies compound. Magnetization showed ferromagnetism (300 K) material. XRD on elevated temperatures orthorhombic-to-tetragonal tetragonal-to-cubic 523 713 K, respectively. Temperature-dependent dielectric response, being leaky, did not reveal any transition. Electrical conductivity obeyed Jonscher power law satisfied correlated barrier-hopping model, indicating dominance hopping conduction mechanism. spectroscopic over wide range (82–673 inferred rhombohedral-to-orthorhombic ~260, 533 Several bands found disappear, while few modes such 225, 270, 289, 831 cm?1 exhibited discontinuity across ~260 K.