title: CdZn2KB2O6F, a new fluoride borate crystal.
abstract: During an attempt to grow crystals of the nonlinear optical material Cd(3)Zn(3)B(4)O(12) using a KBF(4) flux, crystals of a new cadmium dizinc potassium borate fluoride compound, CdZn(2)KB(2)O(6)F, were unexpectedly isolated. The structure consists of layers constructed of distorted corner-sharing ZnO(3)F tetrahedra and BO(3) triangles. Both Zn and B reside on threefold rotation axes, while the F(-) anion is located at a site of 3.2 symmetry. The Cd(II) (site symmetry 3) and K(+) (site symmetry 3.2) ions occupy six- and nine-coordinate interlayer sites, respectively. The BO(3) triangles and ZnO(3) pyramids from the ZnO(3)F tetrahedra share bridging O atoms with each other to form an extended [ZnBO(3)] layer parallel to (001). Although these layers are similar to the [MBO(3)] layers seen in other compounds, they are uniquely bridged here by the Cd centres and F(-) anions to form a three-dimensional framework. In so doing, a series of channels is formed along the [010] direction and the K(+) cations are found in these channels.
authors.affiliation: State Key Laboratory of Enhanced Oil Recovery, Enhanced Oil Recovery Department, Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, People's Republic of China. zhangfan902@petrochina.com.cn
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Zhi-Wei
authors.initials: ZW
authors.lastname: Jiao
authors.forename: De-Zhong
authors.initials: DZ
authors.lastname: Shen
authors.forename: Guang-Qiu
authors.initials: GQ
authors.lastname: Shen
authors.forename: Xiao-Qing
authors.initials: XQ
authors.lastname: Wang
mesh_terms: D001881:Borates / Q000737:chemistry*; D019187:Cadmium Compounds / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005459:Fluorides / Q000737:chemistry*; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*
chemical_list: D001881:Borates; D019187:Cadmium Compounds; D009942:Organometallic Compounds; D005459:Fluorides