牛骨及び合成アパタイト構造中の炭酸イオンの違い

概要

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Carbonate ions incorporated into two hydroxyapatites of different origins cattle bone-originated (r-HAp) and chemically-synthesized (s-HAp) , were compared with emphasis placed on the morphology of these two hydroxyapatites. In r-HAp pretreated at 1073 K, a PO_4-substituted and an OH-substituted carbonate ions were observed. On the other hand, s-HAp had only the PO_4-subsituted carbonate ion. This difference suggested that r-HAp had a more calcium-deficient structure and a larger density of OH-vacancies to compensate the decrease of Ca^<2+>, which moves the OH-substituted carbonate ion forming more easily. This was in agreement with the difference of morphology in the two HAp's observed by field emission-scanning electron microscopy: the r-HAp was constituted by assemblies of relatively round particles of 50-100 nm in diameter, while the s-HAp was bar-shaped particles of 100-300 nm in length, meaning that the r-HAp does not grow so easily as the s-HAp along crystallographic c-axis.
社団法人日本セラミックス協会の論文
1998-04-01