Synthesis and investigation of structural, morphological and dielectric properties of Ba‐ordered BaTiO3 perovskite oxide

Abstract

AbstractThe samples with A‐site cation ordering Ba1−x/2Ti1−xNbxO3 (BTN) with 0 ≤ x ≤ 0.010 were synthesized via the conventional ceramic route by calcining at 1200°C and sintered at 1350°C. The preliminary study of the phase of prepared samples was determined through X‐ray diffraction (XRD) analysis. The Rietveld refinement analysis indicates the tetragonal phase in BTN0 sample, whereas the doped samples exhibit a combination of tetragonal and cubic phases. Presence of Raman band at 308 cm−1 suggests the presence of tetragonal in all samples. The dielectric constant was observed to be 1500 (BTN0), 3000 (BTN5) and 1680 (BTN10) while tangent loss found 0.6 (BTN0), 0.04 (BTN5) and 0.07 (BTN10). All the sample shows same Curie temperature (120°C) due to Ba‐site cation ordering in the sample. Ferroelectric nature in all samples was also confirmed by modified Curie‐Weis law. Based on the current studies, the present materials can be explored as a potential candidate for ferroelectric‐memory devices, dielectric capacitor and energy harvesting applications.