Abstract
0.5KBT-(0.5-x) BF-xLMN with [Formula: see text], 0.04, 0.06, 0.08 and 0.10 ceramics were fabricated using a conventional solid-state reaction method. All samples exhibited a single pseudocubic perovskite phase with minor levels of Bi
4
Ti
3
O[Formula: see text] as a secondary phase. The average grain size decreased slightly with x from [Formula: see text] to 1.8[Formula: see text] [Formula: see text]m and Impedance Spectroscopy at elevated temperatures showed the ceramics to be electrically homogeneous with the insulation resistance of [Formula: see text] all exceeding [Formula: see text] with [Formula: see text] displaying the highest activation energy for conduction at [Formula: see text] [Formula: see text]eV. The permittivity ([Formula: see text] at 100
∘
C) was frequency-dependent, implying relaxor behavior, and exhibited a temperature-stable plateau between [Formula: see text]–250
∘
C. 0.5KBT-0.46BF-0.04LMN had the highest [Formula: see text] and recoverable energy density, [Formula: see text] of 130[Formula: see text]kV[Formula: see text]cm[Formula: see text] and 1.14[Formula: see text] [Formula: see text]J[Formula: see text]cm[Formula: see text], respectively, accompanied by low strain ([Formula: see text]%). The combination of high [Formula: see text], a temperature-stable plateau in permittivity, exceptionally low strain and large [Formula: see text], suggests these compositions have potential for use in multilayer ceramic capacitors (MLCCs) for high voltage/temperature applications in power electronics.