Exploration of structural, relaxor behavior and energy storage performance of Bi(Mg2/3Ta1/3)O3 modified BaTiO3

The effect of Bi(Mg2/3Ta1/3)O-3 (BMT) on the structural, dielectric, and ferroelectric performance of BaTiO3 (BT) has been discussed in the manuscript. The (1-x)BaTiO3-xBi(Mg2/3Ta1/3)O-3(0.05 <= x <= 0.15) compounds are prepared using the mixed oxide route. X-ray diffraction spectroscopy is used to analyze the structure, followed by Rietveld refinement of the XRD patterns and Raman spectroscopy. The structural analysis emphasizes that the compound holds tetragonal symmetry (P4mm) until x =0.075 and is transferred to pseudo-cubic symmetry for x >= 0.10. FE-SEM images have been employed to examine the impact of BMT on the grain size of the BT ceramics. The dielectric characteristics of the (1-x)BT-xBMT solid solutions have been tested throughout a temperature span ranging from 213 K to 473 K at various applied frequencies that indicate the existence of a diffuse phase transition with relaxor behavior. The relaxor nature is further quantified using Vogel-Fultcher fitting. The temperature stability of the permittivity is examined by calculating the Temperature Coefficient of Capacitance (TCC) values. The ferroelectric performance and the energy storage capabilities of the solid solutions have been studied using P-E loops in various electric fields and frequencies. The stability of the hysteresis and energy storage performance with frequency and temperature response was verified. The fatigue endurance was also studied for the optimum composition. The leakage current measurements were carried out for all the compositions. Based on the dielectric, ferroelectric, and energy storage performance, the composition x=0.125 was found to be most suitable for MLCC application