Effect of carbonate contents on crystal structure of a-type carbonate apatites

Toshiyuki Ikoma, Yosinori Kubo, Atsushi Yamazaki, Masaru Akao, Junzo Tanaka

Research output: Contribution to journalConference articlepeer-review

9 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)191-194
Number of pages4
JournalKey Engineering Materials
Publication statusPublished - 2001 Jan 1
Event13th international Symposium on Ceramics in Medicine (BIOCERAMICS) - Bologna, Italy
Duration: 2000 Nov 222000 Nov 26

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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