Chemical preparation, crystal structure and characterization of the new sodium ytterbium cyclotriphosphate Na{sub 3}Yb(P{sub 3}O{sub 9}){sub 2}.9H{sub 2}O
- Laboratoire de Physico-Chimie Minerale, Faculte des Sciences de Bizerte, 7021 Zarzouna-Bizerte (Tunisia)
- Centre de Materiaux, Institut National de Recherche Scientifique et Technique. B.P. 95, Hammam-Lif 2050 (Tunisia)
Chemical preparation and crystal structure are reported for a new lanthanide cyclotriphosphate Na{sub 3}Yb(P{sub 3}O{sub 9}){sub 2}.9H{sub 2}O. This salt crystallizes in the trigonal system, space group R3-bar c with the following parameters: a=30.933(2), c=12.8282(5)A. The crystal structure was refined to R{sub 1}=0.0432 using 1782 reflections with I>2 {sigma}(I). In the Na{sub 3}Yb(P{sub 3}O{sub 9}){sub 2}.9H{sub 2}O structure, the phosphoric ring anions, located around the 3-bar axis are interconnected by YbO{sub 8} dodecahedra and NaO{sub 6} and NaO{sub 7} polyhedra to build, around the threefold axis, large channels parallel to the c axis. All the nine water molecules in the present arrangement participate in the coordination spheres of the associated cations. The thermogravimetric analysis shows that the removal of these water molecules occurs in three stages between 305 and 736K. The vibrational study by IR absorption spectroscopy of Na{sub 3}Yb(P{sub 3}O{sub 9}){sub 2}.9H{sub 2}O is also reported.
- OSTI ID:
- 20902497
- Journal Information:
- Materials Research Bulletin, Vol. 42, Issue 1; Other Information: DOI: 10.1016/j.materresbull.2006.05.019; PII: S0025-5408(06)00216-9; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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