Crystal structure and spectroscopic properties of a new oxyarsenate Li{sub 0.5}Ni{sub 0.25}TiOAsO{sub 4}
- Laboratoire de Chimie des Materiaux Solides, Universite Hassan II, Mohammedia Faculte des Sciences Ben M'Sik, Casablanca (Morocco)
- Institut de Chimie de la Matiere Condensee de Bordeaux (ICMCB-CNRS - UPR 9048), Universite Bordeaux 1, 87 Avenue du Dr. A. Schweitzer, 33608 Pessac Cedex (France)
- Laboratoire Leon Brillouin (CEA-CNRS), CEA/Saclay, 91191 Gif-sur-Yvette Cedex (France)
- Department of Chemistry, University of Pretoria, 0002 Pretoria (South Africa)
The new oxyarsenate Li{sub 0.5}Ni{sub 0.25}TiOAsO{sub 4} has been synthesized and studied by a combination of X-ray powder diffraction, neutrons powder diffraction and vibrational spectroscopy. Li{sub 0.5}Ni{sub 0.25}TiOAsO{sub 4} crystallizes in the monoclinic P2{sub 1}/c space group with the unit cell parameters: a = 6.5854(3) A, b = 7.4665(4) A, c = 7.4969(4) A, {beta} = 89.884(6){sup o}, V = 368.62(1) A{sup 3} and Z = 4. The structure has been determined at room temperature from neutrons diffraction by the Rietveld method analysis. It is formed by a 3D network of TiO{sub 6} octahedra and AsO{sub 4} tetrahedra sharing corners. Structural refinement shows a partial and a statistical occupancy of 2a and 2b sites by Li{sup +} and Ni{sup 2+} ions. TiO{sub 6} octahedra are linked together by corners and form infinite chains along c-axis. Raman and infrared studies confirm the existence of -Ti-O-Ti- chains. Diffuse reflectance spectrum indicates the presence of octahedrally coordinated Ni{sup 2+} ions.
- OSTI ID:
- 21000672
- Journal Information:
- Materials Research Bulletin, Vol. 42, Issue 7; Other Information: DOI: 10.1016/j.materresbull.2006.10.011; PII: S0025-5408(06)00396-5; 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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