Abstract Sr2Na1−3xBixNb5O15 ceramics (SNBN; x = 0.00, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, and 0.08) were synthesized by a conventional solid-state reaction method. To eliminate the impurity phase in the Sr2NaNb5O15 ceramics, we introduced high-charge Bi3+ into the SNN ceramics to reduce the filling degree of A1 and A2 sites. X-ray diffraction results confirmed this compositional design, because all SNBN ceramics showed a pure tetragonal tungsten-bronze phase along with shrinkage of the unit cell when x > 0.01. Meanwhile, Bi3+ introduction improved their dielectric, ferroelectric, and transparent properties. As suggested by Raman and SEM, both the higher densification with relatively uniform grain size and more distorting degree of the NbO6 polar unit contributed to the enhanced electrical properties and transparency at x = 0.04.

中文翻译：

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Bi取代对Sr2Na1−3Bi Nb5O15陶瓷结构、电学性能和透明度的影响

摘要 Sr2Na1−3xBixNb5O15 陶瓷 (SNBN; x = 0.00, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, and 0.08) 通过常规固相反应方法合成。为了消除 Sr2NaNb5O15 陶瓷中的杂质相，我们在 SNN 陶瓷中引入了高电荷 Bi3+ 以降低 A1 和 A2 位的填充程度。X 射线衍射结果证实了这种成分设计，因为当 x > 0.01 时，所有 SNBN 陶瓷都显示出纯四方钨青铜相以及晶胞收缩。同时，Bi3+的引入改善了它们的介电、铁电和透明性能。正如拉曼和扫描电镜所表明的那样，更高的致密化和相对均匀的晶粒尺寸和更大的 NbO6 极性单元的扭曲程度有助于增强 x = 0.04 时的电性能和透明度。