State of Cu2+ ions in precipitated and thermally treated amorphous calcium-magnesium monophosphates doped with copper

V. A. Sinyaev, Elena S. Shustikova, L. V. Levchenko, G. A. Tokseitova

2006

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DOI 10.1134/s1070363206120085
Data confidence 70 medium
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Abstract

Dehydration products of precipitated amorphous calcium-magnesium monophosphates (orthophosphates) with the atomic ratio Mg/(Mg + Ca) of 0.3 doped with copper were studied by the UV and IR Fourier spectroscopy. The substances retain the amorphous nature even on heating up to 550–600°C. Cations Cu2+ in them are in an octahedral surrounding of oxygen atoms and are linked with PO 4 3− groups and, possiblly, with CO 3 2− anions. The OH groups characteristic of hydroxyapatite are not found in the structure. Above 600°C the phosphates crystallize, therewith copper passes in the composition forming crystalline phases, retaining the octahedral surrounding of Cu2+ ions.