High-energy storage and temperature stable dielectrics properties of lead-free BiScO3–BaTiO3–x(Bi0.5Na0.5)TiO3 ceramics

Lead-free (1–x)(0.4BiScO3–0.6BaTiO3)-x(Bi0.5Na0.5)TiO3 (BSBT–xBNT) ceramics were prepared by traditional ceramics preparation method. The energy storage characteristics, as well as dielectric spectrum curves of BSBT–xBNT ceramics, were systematically used in research. The ternary system formed perovskite solid solution with dense and homogenous microstructure. BSBT–xBNT ceramics exhibited slimmer and slanted hysteresis loops followed by higher saturation polarisation (P max) and lower remnant polarisation (P r), which induced high-energy storage density of 1.39 J/cm3 (E = 180 kV/cm). Ranging from 200 to 400°C, BSBT–xBNT ceramics had high permittivities, and a matching dielectric loss, which exhibited flat temperature coefficients of permittivity (TCɛ). The impedance spectroscopy analysis indicated that the non-Debye relaxation mechanism existed in BSBT–xBNT ceramics. BSBT–xBNT ceramics may have potential application value for the high-temperature capacitor.