Hydrothermal Synthesis of Needle-like Apatite Crystal

Masahiro Yoshimura, Hiroyuki Suda, Kengo Okamoto, Koji Ioku

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Hydrothermal syntheses enable us to prepare HAp crystals with various aspect ratios. HAp crystals 50 nm x145 nm, aspect ratio = 2.9) were crystallized from the HAp precursor precipitated from Ca(OH)2 and H3PO4 solutions at 200 °C under 2MPa for 5 h. Among the experimental factors, adding additives are most effective to control the aspect ratio. KOH, K3PO4 and EDTA gave needle-like HAp; aspect ratio = 63 7 and 11, respectively under the similar hydrothermal conditions.

Original languageEnglish
Pages (from-to)1402-1407
Number of pages6
JournalNippon Kagaku Kaishi
Issue number10
Publication statusPublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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