Abstract In this study, a novel superstructure of hexagonal rose-like ammonioalunite was produced by hydrothermal synthesis in acidic condition. Urea was a precipitant in the system. The sharp peaks in the XRD pattern and the clear electron diffraction spots in selected-area electron diffraction (SAED) pattern indicated that ammonioalunite was highly crystallized. SEM images proved that the average diameter of the prepared ammonioalunite is ∼8 μm with a thickness of ∼6 μm. This highly ordered 3D superstructure can expand the scope of potential applications of ammonioalunite in the areas of ceramics, catalysis, electronics, and optoelectronics. The possible mechanism is that the rose-like ammonioalunite was obtained by self-assembling from nanosheets with spiral growth.

中文翻译：

---

水热合成六方玫瑰花状铵铝石

摘要 本研究在酸性条件下通过水热合成制备了一种新型六方玫瑰花状氨铝石超结构。尿素是系统中的沉淀剂。XRD 图中的尖峰和选区电子衍射 (SAED) 图中清晰的电子衍射点表明氨铝石高度结晶。SEM 图像证明所制备的氨铝石的平均直径约为 8 μm，厚度约为 6 μm。这种高度有序的 3D 超结构可以扩大氨铝石在陶瓷、催化、电子和光电子领域的潜在应用范围。可能的机制是通过螺旋生长的纳米片自组装获得玫瑰状氨铝石。