安康矿不相称超晶格有序及相似矿物的晶体化学

安康矿是一种柱红石类新矿物,共化学组成为Ba0.8（Ti,V,Cr）8O16。通讨X光单晶工作。发现其结构在平行c轴方向上,存在一维的不相称超晶格有序。亚结构同柱红石结构,修正的晶胞参数a=10.118（1）A c=2.956（3）A。不相称超结构属四维的布拉维类,可能的超空间群有。不相称超结构与大孔道中的空位、以及由空位引起大阳离子沿c方向上的位移有关

Incommensurate Superlattice Ordering in Ankangite and Crystal Chemistry of the similar Minerals

Ankangite is a new priderite - group mineral. The composition is approximately Ba0.8(Ti, V, Cr)8016. By X-ray single crystal diffraction, one-dimensional incommensurate superlattice ordering is found along the c-axis. The substructure is isostructural with priderite, a= 10.118(1) A ,c= 2.956(3) A. The incommensurate superstructure belongs to four-dimensional Brayais class p14/mmm The possible superspace groups are P. The incommensurate structure is related to the empty sites in tunnels and the displacement of large cations along c.