High-energy storage and temperature stable dielectrics properties of lead-free BiScO(3)–BaTiO(3)–x(Bi(0.5)Na(0.5))TiO(3) ceramics

Abstract

Lead-free (1–x)(0.4BiScO(3)–0.6BaTiO(3))-x(Bi(0.5)Na(0.5))TiO(3) (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/cm^3 (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.

Keywords

• sodium compounds
• barium compounds
• dielectric hysteresis
• dielectric polarisation
• solid solutions
• permittivity
• ferroelectric ceramics
• dielectric losses
• bismuth compounds
• materials preparation
• dielectric relaxation
• traditional ceramics preparation method
• high-energy storage density
• temperature stable dielectric properties
• dielectric spectrum curves
• perovskite solid solution
• microstructure
• hysteresis loops
• saturation polarisation
• remnant polarisation
• permittivities
• dielectric loss
• temperature coefficients
• impedance spectroscopy
• nonDebye relaxation mechanism
• high-temperature capacitor
• temperature 200 degC to 400 degC
• BiScO(3)-BaTiO(3)-(Bi(0.5)Na(0.5))TiO(3)