Abstract
Abstract Calcium, strontium, barium and lead hydroxyapatites have been investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (XAFS) and solid state NMR. XPS analyses showed that the binding energies of P 2s or P 2p and O 1s of all hydroxyapatites, XRD of which matched to the corresponding JCPDS data, were essentially identical and were not influenced by those divalent cations. In contrast, it was revealed that the nearest neighbour distances between divalent cations and oxygen determined by XAFS and the chemical shifts of 1H and 31P NMR were strongly influenced by each divalent cation in hydroxyapatites.
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