La0.5Sr0.5CoO3/Na0.5Bi0.5TiO3/La0.5Sr0.5CoO3(LSCO/NBT/LSCO) ferroelectric capacitors were fabricated on strontium titanate (001)SrTiO3(STO) single crystal substrates by magnetron sputtering and pulsed laser deposition. The epitaxial relationship of [001]NBT//[001]LSCO/[001] STO was confirmed by X-ray diffraction. The effective energy storage density wrec of epitaxial NBT film capacitor increases linearly with the increase of applied electric field. At 1250 kV/cm, wrec reaches 25.7 J/cm3, and the conversion efficiency is high η 64.7%. In addition, in the temperature range from room temperature to 120˚C, Wrec and η all have good thermal stability. The larger Wrec and thermal stabili-ty are attributed to fewer defects and grain boundaries in the epitaxial NBT films.
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