title: High-Temperature Dielectrics in BNT-BT-Based Solid Solution.
abstract: Bi0.5Na0.5TiO3-BaTiO3(BNT-BT)-based ternary solid solutions were investigated for high-temperature capacitor applications. Through a comprehensive investigation of the (1 - x )(0.92Bi0.5Na0.5TiO3-0.08BaTiO3)- x NaNbO3[(1 - x )(BNT-BT)- x NN, x = 0 -0.45] system, 0.85(BNT-BT)-0.15NN was selected as the parent matrix due to its relatively high permittivity (>1800) and favorable energy-storage density (0.56 J/cm3at 7 kV/mm). The effect of bismuth substitution on the dielectric properties of the matrix was further characterized. The introduction of bismuth greatly broadened the operational temperature range of 0.85(BNT-BT)-0.15Na1-3yBiyNbO3ceramics to over 327 °C for a ±15% tolerance. The dc resistivities were of the order of 108- [Formula: see text] magnitude from room temperature to 300 °C. An activation energy of 1.1-1.2 eV in 200-350 °C was obtained from dc resistivity data, suggesting that the conduction process in this temperature range may be associated with oxygen vacancy migration. Furthermore, the energy-storage properties were largely improved by the addition of bismuth. When the substitution of Bi over Na achieved was up to 7%, the energy-storage density and efficiency reached 0.62 J/cm3and 88% at 7 kV/mm, respectively. These results confirm that a BNT-BT-based solid solution is a promising candidate for lead-free high-temperature capacitor applications.
authors.forename: Qi
authors.initials: Q
authors.lastname: Xu
authors.forename: Hanxing
authors.initials: H
authors.lastname: Liu
authors.forename: Juan
authors.initials: J
authors.lastname: Xie
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Luo
authors.forename: Xuechen
authors.initials: X
authors.lastname: Huang
authors.forename: Minghe
authors.initials: M
authors.lastname: Cao
authors.forename: Hua
authors.initials: H
authors.lastname: Hao
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Yao
authors.forename: Michael T
authors.initials: MT
authors.lastname: Lanagan