Preparation of needle‐like hydroxyapatite by homogeneous precipitation under hydrothermal conditions

Yoshinobu Fujishiro, Hiroshi Yabuki, Kunio Kawamura, Tsugio Sato, Akitsugu Okuwaki

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86 Citations (Scopus)


Preparation of hydroxyapatite was carried out by a homogeneous precipitation technique using hydrothermal reactions of Ca(EDTA)2‐ and PO4 3‐ at 130–250°C and pH 4–10. Hydroxyapatite and monetite were formed above pH 6 and below pH 4, respectively. Needle‐like hydroxyapatite was formed at high temperatures above 130°C. The length of the needle‐like hydroxyapatite crystal increased with increasing working solution pH and temperature.

Original languageEnglish
Pages (from-to)349-353
Number of pages5
JournalJournal of Chemical Technology & Biotechnology
Issue number4
Publication statusPublished - 1993 Jan 1


  • calcium‐EDTA chelate
  • homogeneous precipitation
  • hydrothermal reaction
  • hydroxyapatite
  • needle‐like crystal

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Waste Management and Disposal
  • Pollution
  • Organic Chemistry
  • Inorganic Chemistry

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