Abstract
Based on (1 − x)(0.92Bi0.5Na0.5TiO3–0.08BaTiO3)–xNa0.73Bi0.09NbO3 ((1 − x)BNTBT–xNBN) lead-free ternary solid solution, a new energy-storage ceramic system was prepared and firstly reported in this study. The solid solubility of no more than 10 mol% for NBN was revealed by XRD characterization. Growing grains up to ~1.6 μm grain size and obviously broadened er versus T response were observed with increasing NBN from 10 to 40 mol%, indicating the greatly improved dielectric temperature stability. For sample with x = 0.20, optimized energy-storage properties with W = 1.36 J/cm3 and η = 73.9 % were achieved, together with a wide temperature range of −12 to 300 °C with ∣TCC∣ ≤ 15 %, showing potential for high temperature energy-storage applications.
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