Structural, dielectric, electrical, and energy storage properties of Mn‐doped Ba0.55Sr0.45TiO3 ceramics.

A conventional solid‐state reaction route was utilized for the fabrication of Ba0.55Sr0.45Ti1−<italic>x</italic>Mn<italic>x</italic>O3 (<italic>x</italic> = .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 <italic>x</italic> = .006, while an obvious increase in grain size was detected at <italic>x </italic>> .006. A high‐energy storage density (<italic>W</italic>s) of 2.47 J cm−3 and a recoverable energy density (<italic>W</italic>rec) of 1.36 J cm−3 at an applied electric field of 220 kV cm−1 were achieved for <italic>x</italic> = .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. [ABSTRACT FROM AUTHOR]