The crystal structure of BaPO3F revisited – a combined X-ray diffraction and solid-state 19F, 31P MAS NMR study
作者:Berthold Stöger、Matthias Weil、Jørgen Skibsted
DOI:10.1039/c3dt50373a
日期:——
precipitation, whereas single crystals were obtained using a long-lasting gel growth method. The samples were characterized by powder- and single-crystal X-raydiffraction, which revealed orthorhombic symmetry for the polycrystalline material and monoclinic symmetry for the single crystals. Both phases belong to the same order–disorder (OD) family and can be derived from the baryte structure (BaSO4) by replacing
通过快速沉淀以多晶形式制备单氟磷酸钡BaPO 3 F,而使用长效凝胶生长法获得单晶。样品通过粉末和单晶X射线衍射进行表征,揭示了多晶材料的正交斜对称性和单晶的单斜晶对称性。这两个相都属于同一个有序无序(OD)族,可以通过在两个方向上用等电子PO 3 F 2-阴离子代替SO 4 2-阴离子而从重晶石结构(BaSO 4)衍生而来。磷酸钡3F可以在无限数量的局部等效层堆叠序列中结晶。多晶材料代表族结构,其特征在于层的纯随机堆积。其结构与重晶石结构同型,并包含无序的PO 3 F 2-阴离子。单晶[ P 2 1 / c,Z = 4,a = 11.3105(7)Å,b = 8.6934(5)Å,c = 9.2231(4)Å,β = 127.819(3)°,R [ F 2 > 2σ(F 2]] = 0.036,4146个结构因子,110个参数]结晶为具有最大有序度(MDO)的多型,可以视为重晶石结构