Abstract
Bi0·.5Na0·.5TiO3 (BNT)-based lead-free dielectric materials have attracted extensive research in environment-friendly ferroelectrics due to their high dielectric constant and negligible remanent polarisation. In accordance with previous reports, although BNT-based ceramics obtain large recoverable energy storage density (Wrec > 3 J/cm3), they are commonly accompanied with high dielectric breakdown strength (Eb ≥ 200 kV/cm), which is unfavourable to the practical application of dielectric capacitors. In this study, novel (1-x)Bi0·5Na0·5TiO3-xSr0.7Nd0.2TiO3 (BNT-xSNT) materials were designed and fabricated. The introduction of Sr0.7Nd0.2TiO3 decreases the grain size and induces the polar nano regions. An outstanding recoverable energy storage density (Wrec = 3.09 J/cm3) with medium efficiency (η = 77%) is obtained at 182 kV/cm for 0.7BNT–0.3SNT ceramics. Good temperature stability (25–160 °C) and excellent frequency stability (5–200 Hz) are realised at 100 kV/cm. This research provides a promising energy storage ceramic material for pulsed power system applications and serves as reference for the integration and miniaturisation of electronic devices.
Published Version
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