New Mixed-Valent Iron (II/III) Phosphates, Cu3−xFe4+x(PO4)6

New Mixed-Valent Iron (II/III) Phosphates, Cu3−xFe4+x(PO4)6

The phase formation in the system Cu3−xFe4+x(PO4)6 (0≤x≤1) was investigated at 920°C under air. These phosphates were studied by X-ray powder diffraction and Mossbauer spectroscopy. At 0.3≤x≤0.95 new phosphates, Cu3−xFe4+x(PO4)6, are formed which are isotypic with Fe7(PO4)6. Mossbauer spectroscopy c...

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Veröffentlicht in:Journal of solid state chemistry 2000-02, Vol.150 (1), p.159-166
Hauptverfasser: Belik, A.A., Malakho, A.P., Pokholok, K.V., Lazoryak, B.I., Khasanov, S.S.
Format: Artikel
Sprache:eng
Schlagworte:
copper
crystal structure
iron
Mossbauer spectroscopy
phosphates
Rietveld method
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Zusammenfassung:The phase formation in the system Cu3−xFe4+x(PO4)6 (0≤x≤1) was investigated at 920°C under air. These phosphates were studied by X-ray powder diffraction and Mossbauer spectroscopy. At 0.3≤x≤0.95 new phosphates, Cu3−xFe4+x(PO4)6, are formed which are isotypic with Fe7(PO4)6. Mossbauer spectroscopy confirms that the structure stabilizes Fe2+ cations up to 19% under air. At 0≤x
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.1999.8572