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Synthesis and crystal structure of Na4Ni7(AsO4)6

机译:Na4Ni7(AsO4)6的合成与晶体结构

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The title compound, tetra­sodium hepta­nickel hexa­arsenate, was obtained by ceramic synthesis and crystallizes in the monoclinic space group C2/m. The asymmetric unit contains seven Ni atoms of which two have site symmetry 2/m and three site symmetry 2, four As atoms of which two have site symmetry m and two site symmetry 2, three Na atoms of which two have site symmetry 2, and fifteen O atoms of which four have site symmetry m. The structure of Na4Ni7(AsO4)6 is made of layers of Ni octa­hedra and As tetra­hedra assembled in sheets parallel to the bc plane. These layers are inter­connected by corner-sharing between NiO6 octa­hedra and AsO4 tetra­hedra. This linkage creates tunnels running along the c axis in which the Na atoms are located. This arrangement is similar to the one observed in Na4Ni7(PO4)6, but the layers of the two compounds are slightly different because of the disorder of one of the Ni sites in the structure of the title compound.
机译:通过陶瓷合成获得标题化合物庚锡六砷酸四钠,并在单斜空间群C2 / m中结晶。该不对称单元包含七个Ni原子,其中两个具有位对称2 / m和三个位对称2,四个As原子,其中两个具有位对称m和两个位对称2,三个Na原子,其中两个具有位对称2,和15个O原子,其中4个具有位对称m。 Na 4 Ni 7(AsO 4)6的结构是由八面体Ni和四面体As组成,它们平行于bc平面成片状组装。这些层通过NiO6八面体和AsO4四面体之间的角共享而互连。这种联系形成了沿Na原子所在的c轴延伸的隧道。这种排列方式类似于在Na4Ni7(PO4)6中观察到的排列方式,但是由于标题化合物结构中Ni位置之一的无序,两种化合物的层略有不同。

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