On the intersecting tunnel structure of the monophosphates A3(V,W)4O9(PO4)2 with A = Rb,Tl, Cs |
| |
| Institution: | 1. Department of Biology, Ecology & Biodiversity Research Unit, Vrije Universiteit Brussel, Brussels, Belgium;2. Centre for Biological Control, Department of Zoology & Entomology, Rhodes University, Makhanda, South Africa;3. Multidisciplinary Institute for Teacher Education, Science & Technology (MILO), Vrije Universiteit Brussel, Brussels, Belgium;4. Centre for Biological Control, Department of Botany, Rhodes University, Makhanda, South Africa;1. University of California, Davis, USA;2. University of Pennsylvania, PA, USA;3. Adobe Research, India |
| |
| Abstract: | The structure determination of a single crystal with composition Rb3V1.63W2.37O9(PO4)2 shows that this phase belongs to the ‘KNbW’ type (K3Nb3WO9(PO4)2). This intersecting tunnel structure which consists of octahedral MO3]∞ chains interconnected with ‘MPO9’ units is closely related to the ‘KVW’-type (K3V2W2O9(PO4)2), and differs only from the latter by the relative orientation of the MO3]∞ chains. In the same way, the X-ray powder diffraction study of the phosphates A3V2W2O9(PO4)2 with A = Rb, Tl, Cs and Rb3VxW4 − x O9(PO4)2 (1.5 ≤ x ≤ 3), shows that they all belong to the same structural ‘KNbW’-type and not to the ‘KVW’-type. These results demonstrate the great flexibility of the ‘KNbW’ structure with regard to the ‘KVW’-structure only observed for one compound. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
