Structural, dielectric, electrical, and energy storage properties of Mn‐doped Ba_0.55Sr_0.45TiO₃ ceramics

Abstract

A conventional solid‐state reaction route was utilized for the fabrication of Ba0.55Sr0.45Ti1−xMnxO3 (x = .004, .006, .008, .01, and .015) ceramics. X‐ray diffraction (XRD) diffractograms revealed pseudo‐cubic structural symmetry with a single phase. The scanning electron microscope (SEM) images revealed fine grain morphology for x = .006, while an obvious increase in grain size was detected at x > .006. A high‐energy storage density (Ws) of 2.47 J cm−3 and a recoverable energy density (Wrec) of 1.36 J cm−3 at an applied electric field of 220 kV cm−1 were achieved for x = .006. An impedance spectroscopic study showed the electrical response relationship with microstructure. The observed two semicircles in Nyquist plots are an indication of the contribution of grains (bulk) and grain boundaries as a resistive medium for conduction of charge carriers, which led to enhanced the capability in capacitor applications.