Abstract
Inducing slimmer P-E loops while maintaining high ferroelectric polarization is a major challenge in dielectric capacitor applications. In this work, strontium (Sr) doped and strontium-manganese (Sr, Mn) co-doped 0.925(Bi1/2Na1/2)TiO3-0.075BaTiO3 (BNT7.5BT) ceramics were prepared to study energy storage performance. Sr-doped BNT7.5BT samples showed enhanced relaxor ferroelectric behavior and reduced remanent polarization (Pr) and coercive field (Ec) which can be attributed to the disruption of ferroelectric long-range order by the presence of non-polar cubic Pm3-m phase. (Sr, Mn) co-doped BNT7.5BT samples revealed improved energy storage density of 0.90 J/cm3 and thermal stability, affirming the vital role of Mn ions. The presence of MnTi″-VOoo defect-dipoles can create a dipole moment (PD) which can result in an internal field causing a constricted ferroelectric hysteresis loop with low Pr and Ec. Surface screening of polarization bound charges by Mn-induced defects affects the overall Pmax contribution to energy storage density.
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