Structure of hydroxyapatite powders prepared through dicalcium phosphate dihydrate hydrolysisстатья
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Дата последнего поиска статьи во внешних источниках: 26 августа 2016 г.
Аннотация:We have studied the structure of hydroxyapatite (HA) powders prepared by hydrolyzing dicalcium phosphate dihydrate (DCPD) in an aqueous sodium acetate solution at a temperature of 60A degrees C for 16 h or a longer time. The results demonstrate that the HA in the powders has a distorted structure. The Baur's distortion index for the PO4 tetrahedra is DI(TO) a parts per thousand integral 0.03, whereas hydroxyapatite single crystals have DI(TO) a parts per thousand integral 0.005. The powders are similar in structural parameters to calcium-deficient HAs: they have Ca/P a parts per thousand integral 1.6 and an imperfect substructure (crystallite size of a parts per thousand integral 30 nm) and contain sodium impurities. The structural features of the HA powders are analyzed in the context of their ability to biodegrade (dissolve).