Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi, China.
Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi, China.
ACS Appl Mater Interfaces. 2023 Mar 8;15(9):11642-11651. doi: 10.1021/acsami.2c18827. Epub 2023 Feb 27.
A series of tungsten bronze SrNaBiNbTaO (SBNN-Ta) ferroelectric ceramics were designed and synthesized by the traditional solid-phase reaction method. The B-site engineering strategy was utilized to induce structural distortion, order-disorder distribution, and polarization modulation to enhance relaxor behavior. Through investigating the impact of B-site Ta replacement on the structure, relaxor behavior, and energy storage performance, this study has shed light on the two main factors for relaxor nature: (1) with the increase of Ta substitution, the tungsten bronze crystal distortion and expansion induced the structural change from an orthorhombic 2 phase to 2 phase at room temperature; (2) the transition from ferroelectric to relaxor behavior could be attributed to the coordinate incommensurate local superstructural modulations and the generation of nanodomain structure regions. Moreover, we benefited from the effective decrease of ceramic grains and inhibition of abnormal growth. Finally, we obtained an effective energy storage density () ∼ 1.6 J/cm, an efficiency (η) ∼ 80%, a current density () ∼ 1384.2 A/cm, and a power density () ∼ 138.4 MW/cm.
一系列钨青铜 SrNaBiNbTaO（SBNN-Ta）铁电陶瓷通过传统的固相反应法设计和合成。利用 B 位工程策略诱导结构变形、有序-无序分布和极化调制，以增强弛豫行为。通过研究 B 位 Ta 取代对结构、弛豫行为和储能性能的影响，本研究揭示了弛豫体性质的两个主要因素：（1）随着 Ta 取代的增加，钨青铜晶体的畸变和膨胀导致室温下结构从正交 2 相转变为 2 相；（2）铁电向弛豫行为的转变归因于配位失谐局部超结构调制和纳米畴结构区域的产生。此外，我们受益于陶瓷晶粒的有效减小和异常生长的抑制。最后，我们获得了有效的储能密度（）∼1.6 J/cm，效率（η）∼80%，电流密度（）∼1384.2 A/cm，和功率密度（）∼138.4 MW/cm。
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