A-type carbonate apatites with different CO3 contents were obtained by heating hydroxyapatite powder in dry carbon dioxide atmosphere at 1173 K for 1 to 64 hours. The replacement of CO3 ions lowered the crystal symmetry to hexagonal (P63/m) → hexagonal (P-6) → monoclinic (Pb) in that order. The a-axis parameters were linearly increased with the increase of CO3 ions, while the b- and c-axis parameters were varied little. The lattice parameters of the A-type carbonate apatite completely replaced by CO3 ions were refined to be a = 0.9572(1), b = 0.6877(1). The splitting of IR absorption bands attributed to a PO4 ion also supported the lowering of crystal symmetries.
|ジャーナル||Key Engineering Materials|
|出版ステータス||Published - 2001 1月 1|
|イベント||13th international Symposium on Ceramics in Medicine (BIOCERAMICS) - Bologna, Italy|
継続期間: 2000 11月 22 → 2000 11月 26
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