In order to prepare high performance dielectric ceramics which can be used in the field of pulse power capacitors，a compact and uniform NBTST based lead-free relaxor ferroelectric ceramics were prepared by the traditional solid-state reaction method． The energy storage density of NBT-ST-1Ce ceramic sample at room temperature was 1. 07 J / cm3，and the energy storage efficiency was more than 80%． In addition，the energy storage efficiency of the ceramics showed a very good temperature stability which was around 95% in the temperature range of 25—150 ℃．Therefore，this kind of dielectric material has exhibited a very good potential in the field of pulse power capacitors applications．
Key words bismuth sodium titanate，dielectric energy storage，temperature stability，relaxor ferroelectric，cerium dioxide
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