crystallographic positions. One molybdenum site has icosahedral zinc coordination. The other molybdenum atoms were found on a position with mixed Mo/Zn occupancy. It is coordinated by 14 zinc atoms in the form of a cube where all faces are capped. The zinc atoms have a great variety of coordination polyhedra with between 10 and 16 neighbors of which at most two are molybdenum atoms. Many of the atomic positions
通过缓慢冷却具有高
锌含量的二元合
金,可以得到标题化合物的良好发育的晶体。它们的晶体结构已由四圆X射线衍射仪数据确定。确认了NbZn 3的Cu 3 Au型结构。对于943个结构因子和50个可变参数,NbZn 16具有TiZn 16型结构= Cmcm,a = 769.6(1)pm,b = 1143.6(1)pm,c = 1166.3(1)pm,Z = 4,R = 0.021 。MoZn 20.44在立方晶面中心晶胞中以新的结构类型结晶并具有392个原子:F 3 m,a = 1846.4(1)pm,对于768 F值和64个变量,R = 0.059 。原子位于17个不同的晶体学位置。一个
钼位点具有二十面体
锌配位。在
钼/
锌混合占据的位置上发现了其他
钼原子。它由14个
锌原子以立方体的形式协调,所有面都被覆盖。
锌原子具有多种配位多面体,它们之间有10至16个相邻原子,其中最多两个为
钼原子。许多原子位置与Mg