TY - JOUR
T1 - Effect of carbonate contents on crystal structure of a-type carbonate apatites
AU - Ikoma, Toshiyuki
AU - Kubo, Yosinori
AU - Yamazaki, Atsushi
AU - Akao, Masaru
AU - Tanaka, Junzo
PY - 2001/1/1
Y1 - 2001/1/1
N2 - 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.
AB - 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.
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M3 - Conference article
AN - SCOPUS:0035151575
VL - 192-195
SP - 191
EP - 194
JO - Key Engineering Materials
JF - Key Engineering Materials
SN - 1013-9826
T2 - 13th international Symposium on Ceramics in Medicine (BIOCERAMICS)
Y2 - 22 November 2000 through 26 November 2000
ER -