Synthesis, structure and characterisation of Fe{sub 0.50}Ti{sub 2}(PO{sub 4}){sub 3}: A new material with Nasicon-like structure
- LCMS, UFR Sciences des Materiaux Solides, Faculte des Sciences Ben M'Sik, Casablanca (Morocco)
- Institut de chimie de la matiere condensee de Bordeaux (ICMCB-CNRS UPR 9048), Universite de Bordeaux1, 33608 Pessac (France)
A new iron titanyl phosphate Fe{sub 0.50}Ti{sub 2}(PO{sub 4}){sub 3} was synthesized by both solid-state reaction and Cu{sup 2+}-Fe{sup 2+} ion exchange method. The material was then characterized by X-ray diffraction, Mossbauer, magnetic susceptibility measurements and optical absorption. The crystal structure of the compound was refined, using X-ray powder diffraction data, by the Rietveld profile method; it crystallizes in the rhombohedral system, space group R3-bar, with a=8.511(1)A and c=20.985(3)A, V=1316.45(3)A{sup 3} and Z=6. The structure, which is compared to that of Mn{sub 0.50}Ti{sub 2}(PO{sub 4}){sub 3} is built up from [TiO{sub 6}] octahedra and [PO{sub 4}] tetrahedra which are linked by corner sharing along the c-axis. Fe{sup 2+} cations are located in half of the antiprism M{sub I} sites and are orderly distributed with vacancies within the two possible positions of the M{sub I} sites of R3-bar. These results were supported by the Mossbauer studies that showed the presence of one Fe{sup 2+} site in the high spin state (t{sub 2g}{sup 4}e{sub g}{sup 2}). The Curie-Weiss-type behavior is observed in the magnetic susceptibility. Diffuse reflectance spectrum indicates the presence of octahedrally coordinated Fe{sup 2+} ions.
- OSTI ID:
- 21015866
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 7; Other Information: DOI: 10.1016/j.jssc.2007.04.014; PII: S0022-4596(07)00167-3; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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