Abstract
In the course of our investigation aimed at the preparation of anisotropic cluster materials using a combination of oxide and chloride ligands to induce directional bonding preferences in the cluster unit, a series of niobium oxychloride cluster compounds AxNb6Cl12O2 (A = K, x=0.72(2); A=Rb, x=0.736(7); A=Cs, x=0.938(4); A=In, x=0.634(8)) was obtained by solid state synthesis. The cluster framework is based on (Nb6Cl10iO2i)Cl4 aO2a clusters connected via oxide ligands in the a→ direction with two Nb-O linkages between adjacent clusters, which resembles intercluster bonding in Chevrel-Sergent phases, while in the other two directions, the linkages occur through single Cla-a bridges. The framework generates channels where the cations A+ are located. The electronic band structure of the series features a narrow partially occupied band originating from a Nb-Nb bonding state. Magnetic and ESR measurements show the presence of localized unpaired electrons, and resistivity measurements indicate a semiconducting behavior.
Original language | English (US) |
---|---|
Pages (from-to) | 218-228 |
Number of pages | 11 |
Journal | Journal of Alloys and Compounds |
Volume | 338 |
Issue number | 1-2 SPEC. |
DOIs | |
State | Published - May 16 2002 |
Keywords
- Anisotropic materials
- Band structure
- Clusters
- Crystal structure
- Niobium
- Oxychlorides
ASJC Scopus subject areas
- Metals and Alloys