碱金属
碱土金属
化学
热液循环
双折射
晶体结构
水热反应
水热合成
衍射
结晶学
Crystal(编程语言)
X射线晶体学
金属
材料科学
物理
光学
地震学
程序设计语言
有机化学
地质学
计算机科学
作者
Minqiang Gai,Ying Wang,Tao Tong,Liying Wang,Zhihua Yang,Xin Zhou,Shilie Pan
摘要
In minerals and artificial crystals, the OH and F groups often coexist and have a high probability of disordered structure. The OH/F position cannot be determined accurately in the crystal structure only by the direct X-ray diffraction method because of the poor contrast between O and F and the weak diffractivity of hydrogen atoms. In this work, a new fluorooxoborate Ba[B2OF3(OH)2]2, with a size of up to 12 × 4 × 3 mm3, has been synthesized successfully by a facile hydrothermal reaction. The BOF3 units with well-ordered OH/F positions are observed for the first time in alkali/alkaline earth metal fluorooxoborates. Owing to the selective fluorination of BO4, Ba(B2OF3(OH)2)2 exhibits a large birefringence and hence can be used as a DUV birefringent material. This work will guide the study of the structural chemistry of oxyfluorides.
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