【摘要】 本文用X射线粉末衍射方法测定了Zn（IO₃）₂的晶体结构。Zn（IO₃）₂属单斜晶系,空间群为P112₁,点阵常数为:a=5.469A,b=2a=10.938A,c=5.1158A,γ=120°。单胞体积v=265.027A³,ρ为5.08g/cm₃。每单胞含2个化合式单位,18个原子分别占据九组2（a）等效位置。测定了原子参数。 Zn（IO₃）₂晶体由IO₃^-三角锥体和略带畸变的ZnO₆八面体组成。IO₃^-中的I-O平均键长1.81A,键角98.4°,形成近似六角密排列,I^v分布在z=O和z=（1/2）的平面。Zn²⁺略偏离I^v原子的平面,IO₃^-的所有O→I矢量都具有与c点阵矢量反平行的分量。本文讨论了极性晶体α-LiIO₃,Mg（IO₃）₂,Zn（IO₃）₂,LiIO₃-Mg（IO₃）₂,α-Cu（IO₃）₂晶体结构之间的相互关系。更多还原

【Abstract】 The structure of Zn（IO₃）₂ crystal has been determined by means of Ⅹ-ray powder diffraction method.It belongs to monoclinic system.The space group is P112₁.Lattice constants are: α=5.469A,b=2α=10.938A,c=5.1158A,γ=120°.The density is equal to 5.08g/cm³.There are two formula units per unit cell.18 atoms in a unit cell are situated at the 9 sets 2（a） positions respectively.Their atomic parameters are: The crystal structure of Zn（IO₃）₂ consists of IO₃^- triangular pyramidals and slightly distorted ZnO₆ octahedrons.The average length of three short bonds in two independent IO₃^- is 1.81A with average bond angle about 98.4°.The iodate ions form a nearly regular hexagonal closest-packed array,with iodine atoms at z=0 and 1/2.The resulting distorted octahedral interstices are occupied by zine ions which lie out of the iodine planes.All O→I vectors in IO₃^- have a component directed antiparallel to the c lattice vector. The mutual relation between the structures of α-LiIO₃,Mg（IO₃）₂,LiIO₃-Mg （IO₃）₂ solid solution,Zn（IO₃）₂ and α-Cu（IO₃）₂ crystals has also been discussed更多还原