ABSTRACT Aurivillius phase BaBi4Ti4O15 micro-sized powders were produced by solid-state reaction and their photocatalytic properties were reported for the first time. X-ray diffraction revealed the polar orthorhombic structure. BaBi4Ti4O15 ceramics exhibited diffuse phase transition at ∼ 410°C. The freezing temperature of 274°C was obtained by fitting the Vogel–Fulcher law. The distinct ferroelectric domain switching current peaks in current – electric field (I-E) loop and piezoelectric coefficient d33 value of 7.0 ± 0.1 pC/N at room temperature further demonstrated relaxor ferroelectric behaviour of BaBi4Ti4O15. UV-vis absorption spectra indicated that BaBi4Ti4O15 had a direct band gap of 3.2 eV. The photocatalytic study showed 15% degradation of Rhodamine B (RhB) solution by BaBi4Ti4O15 powders after 3.5 h UV-vis irradiation. The RhB degradation rate was further enhanced by depositing Ag nanoparticles on the BaBi4Ti4O15 powders surface. This work suggested that the relaxor ferroelectric BaBi4Ti4O15 is promising for photocatalytic applications.

中文翻译：

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BaBi4Ti4O15的弛豫铁电和光催化性能

摘要 通过固相反应制备了 Aurivilius 相 BaBi4Ti4O15 微粉，并首次报道了其光催化性能。X 射线衍射揭示了极性正交结构。BaBi4Ti4O15 陶瓷在~410°C 表现出扩散相变。274°C 的冷冻温度是通过拟合 Vogel-Fulcher 定律获得的。电流-电场 (IE) 回路中明显的铁电畴切换电流峰值和室温下 7.0 ± 0.1 pC/N 的压电系数 d33 值进一步证明了 BaBi4Ti4O15 的弛豫铁电行为。UV-vis 吸收光谱表明 BaBi4Ti4O15 的直接带隙为 3.2 eV。光催化研究表明，BaBi4Ti4O15 粉末在 UV-vis 照射 3.5 小时后对罗丹明 B (RhB) 溶液的降解率为 15%。通过在 BaBi4Ti4O15 粉末表面沉积银纳米粒子进一步提高了 RhB 的降解率。这项工作表明弛豫铁电 BaBi4Ti4O15 有望用于光催化应用。