Crystal structure, magnetic susceptibility and Mossbauer spectroscopy of the mixed-valence iron phosphate Na{sub 1/2}Cu{sub 4/3}Fe{sub 2}(PO{sub 4}){sub 3}
- Laboratoire de Chimie Structurale des Materiaux, Departement de Chimie, Faculte des Sciences, 5019 Monastir (Tunisia)
- Institut de Chimie de la Matiere Condensee de Bordeaux, CNRS, 87, Avenue du Dr. A. Schweitzer, 33608 Pessac-Cedex (France)
Single crystals of a new mixed-valent iron phosphate Na{sub 1/2}Cu{sub 4/3}Fe{sub 2}(PO{sub 4}){sub 3} have been synthesized by a flux method and structurally characterized from X-ray diffraction data. Crystal data: space group P1-bar ; a=6.2882(1)A; b=8.0459(1)A; c=9.3255(1)A; {alpha}=105.881(1){sup o}; {beta}=107.202(1){sup o}; {gamma}=101.467(1){sup o}; Z=2; R{sub 1}=0.03; wR{sub 2}=0.093. The three-dimensional structure was found to be closely related to that of the well known Howardevansite structural type. It results from infinite chains of CuO{sub 5} and FeO{sub 6} polyhedra, joined together by (Cu,-bar )O{sub 6} octahedra and PO{sub 4} tetrahedra by corner-sharing. The large cavities in framework are occupied by Na{sup +} ions. The magnetic susceptibility study revealed an antiferromagnetic behavior with Neel temperature of approximately 40K. The Mossbauer spectroscopy confirmed the presence of iron in both +2 and +3 oxidation states.
- OSTI ID:
- 20905315
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 6; Other Information: DOI: 10.1016/j.jssc.2006.03.025; PII: S0022-4596(06)00173-3; Copyright (c) 2006 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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