Abstract The immense potential of energy storage materials applied in high energy storage devices has promoted the development of various materials and the exploration of structure. Here, we present the original observations on an unusual coexistent-phase structure in relaxor ferroelectric ceramics 0.2Pb(Mg1/3Nb2/3)O3-0.8Pb(SnxTi1-x)O3 (PMN-PST). The novel structure containing independent ferroelectric and relaxor phase in a single grain induces multiple electric response. More importantly, PMN-PST ceramics with the coexistent-phase structure exhibit the enhanced energy storage based on a high voltage pulse measurement. The maximum energy density reaches up to 0.85 J/cm3 at 70 kV/cm for x = 0.48, nearly three times of that of the ferroelectric ceramic (x = 0.36). It is proposed that the coexistent-phase structure generates domain switching and gives rise to coexistent-phase charge coupling that are together responsible for the excellent energy storage performance. This work opens a new pathway to develop relaxor ferroelectric materials in high energy storage fields.

中文翻译：

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弛豫铁电陶瓷中异常共存相结构引起的多重电响应和增强的能量存储

摘要 储能材料在高储能器件中的巨大应用潜力促进了各种材料的发展和结构的探索。在这里，我们展示了对弛豫铁电陶瓷 0.2Pb(Mg1/3Nb2/3)O3-0.8Pb(SnxTi1-x)O3 (PMN-PST) 中异常共存相结构的原始观察。在单个晶粒中包含独立的铁电相和弛豫相的新型结构会引起多重电响应。更重要的是，具有共存相结构的 PMN-PST 陶瓷表现出基于高压脉冲测量的增强的能量存储。最大能量密度在 70 kV/cm 时达到 0.85 J/cm3，x = 0.48，几乎是铁电陶瓷（x = 0.36）的三倍。提出共存相结构产生域切换并产生共存相电荷耦合，这些共同负责出色的储能性能。这项工作为在高储能领域开发弛豫铁电材料开辟了一条新途径。