Electrostatic energy storage technology based on dielectrics is fundamental to advanced electronics and high-power electrical systems. Recently, relaxor ferroelectrics characterized by nanodomains have shown great promise as dielectrics with high energy density and high efficiency. We demonstrate substantial enhancements of energy storage properties in relaxor ferroelectric films with a superparaelectric design. The nanodomains are scaled down to polar clusters of several unit cells so that polarization switching hysteresis is nearly eliminated while relatively high polarization is maintained. We achieve an ultrahigh energy density of 152 joules per cubic centimeter with markedly improved efficiency (>90% at an electric field of 3.5 megavolts per centimeter) in superparaelectric samarium-doped bismuth ferrite–barium titanate films. This superparaelectric strategy is generally applicable to optimize dielectric and other related functionalities of relaxor ferroelectrics.

中文翻译：

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超顺电弛豫铁电体中的超高能量存储

基于电介质的静电储能技术是先进电子和大功率电气系统的基础。最近，以纳米域为特征的弛豫铁电体作为具有高能量密度和高效率的电介质已显示出巨大的前景。我们展示了具有超顺电设计的弛豫铁电薄膜的储能性能显着增强。将纳米域按比例缩小为几个晶胞的极性簇，从而几乎消除了极化切换滞后，同时保持了相对较高的极化。我们在超顺电钐掺杂的铁酸铋-钛酸钡薄膜中实现了 152 焦耳/厘米的超高能量密度，并显着提高了效率（在 3.5 兆伏/厘米的电场下 > 90%）。