Аңдатпа
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.