Abstract
Structure of γ-irradiated calcium phosphates synthesized in different conditions was studied by means of ESR. It has been shown that amorphous and nanocrystalline calcium phosphates have qualitatively different ESR spectra. The new paramagnetic center in hydroxyapatite (HA) has been found. It consists of four protons of water molecules located in the parallelogram vertexes and the free electron formed in HA by γ-irradiation. This center is thermally stable up to 300°C, when the water molecules release from the HA crystal lattice.
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