Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr2NaNb5O15-Based Tungsten Bronze Ceramics,ACS Applied Materials & Interfaces

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Ferroelectric-Relaxor Crossover and Energy Storage Properties in Sr2NaNb5O15-Based Tungsten Bronze Ceramics
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-02-08 , DOI: 10.1021/acsami.1c23673
Lei Cao ₁ , Ying Yuan ₁ , Xiangjun Meng ₁ , Enzhu Li ₁ , Bin Tang ₁

Affiliation

Filled and unfilled Sr₂NaNb₅O₁₅-based tungsten bronze ceramics based on Gd doping were prepared using a traditional solid-state reaction method. Relaxor behaviors of the two different systems were analyzed, and the corresponding energy storage performance was also characterized. With the support of weakly coupled polar nanoregions and a non-polar matrix, an energy storage density of 2.37 J/cm³ and an efficiency of 94.4% were obtained in the Sr_1.82Gd_0.12NaNb₅O₁₅ ceramic. A discharge energy density of 2.51 J/cm³ and a power density of 59.1 MW/cm³ further proved its prospect for practical applications. In addition, the thermal stability and fatigue resistance of the ceramic were also evaluated. At the same time, under the theoretical framework of a perovskite and tungsten bronze, the contribution of vacancies to the local structure and relaxor behavior was briefly discussed. Because the currently used ceramics do not contain easily reducible metal oxides, this work lays the foundation for the development of multilayer ceramic capacitors that use base metals as internal electrodes.

中文翻译：

Sr2NaNb5O15 基钨青铜陶瓷的铁电-弛豫交叉和储能性能

采用传统的固相反应方法制备了基于Gd掺杂的填充和未填充Sr ₂ NaNb ₅ O _{15基钨青铜陶瓷。}分析了两种不同系统的弛豫行为，并对相应的储能性能进行了表征。_{在弱耦合极性纳米区域和非极性基体的支持下，Sr 1.82} Gd _0.12 NaNb ₅ O ₁₅陶瓷的储能密度为2.37 J/cm ³，效率为94.4% 。放电能量密度2.51 J/cm ³，功率密度59.1 MW/cm ³进一步证明了它的实际应用前景。此外，还评价了陶瓷的热稳定性和抗疲劳性。同时，在钙钛矿和钨青铜的理论框架下，简要讨论了空位对局部结构和弛豫行为的贡献。由于目前使用的陶瓷不含易还原的金属氧化物，这项工作为开发使用贱金属作为内电极的多层陶瓷电容器奠定了基础。

更新日期：2022-02-08

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