Yun Hoseop, Kim Gangbeom
Division of Energy Systems Research and Department of Chemistry, Ajou University, Suwon 443-749, Republic of Korea.
Acta Crystallogr Sect E Struct Rep Online. 2008 Dec 13;65(Pt 1):i1. doi: 10.1107/S1600536808041585.
The new layered ternary sulfide, Nb(1.30)Cr(0.70)S(5), niobium chromium penta-sulfide, is isostructural with the solid solution Nb(1+x)V(1-x)S(5) and belongs to the FeNb(3)Se(10) structure type. Each layer is composed of two unique chains of face-sharing [NbS(8)] bicapped trigonal prisms (m symmetry) and edge-sharing [MS(6)] (M= Nb, Cr) octa-hedra (m symmetry). One of the two metal sites is occupied by statistically disordered Nb and Cr atoms, with 0.3 and 0.7 occupancy, respectively. The chains are connected along the c axis, forming two-dimensional layers, which then stack on top of each other to complete the three dimensional structure. As a result, an undulating van der Waals gap is found between the layers.
新型层状三元硫化物Nb(1.30)Cr(0.70)S(5)，即铌铬五硫化物，与固溶体Nb(1+x)V(1-x)S(5)同构，属于FeNb(3)Se(10)结构类型。每一层由两个独特的链组成，一个是由共面的[NbS(8)]双帽三角棱柱（m对称性）构成的链，另一个是由共边的[MS(6)]（M = Nb、Cr）八面体（m对称性）构成的链。两个金属位点之一被统计无序的Nb和Cr原子占据，占有率分别为0.3和0.7。这些链沿c轴连接，形成二维层，然后这些层相互堆叠以完成三维结构。结果，在层之间发现了起伏的范德华间隙。
