Well-formed one-dimensional hydroxyapatite crystals grown by an environmentally friendly flux method

Katsuya Teshima, Sun Hyung Lee, Mitsuo Sakurai, Yoshitaka Kameno, Kunio Yubuta, Takaomi Suzuki, Toetsu Shishido, Morinobu Endo, Shuji Oishi

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

Highly crystalline, well-developed hydroxyapatite (HAp) crystals were grown successfully for the first time by a flux cooling method at a temperature less than 500 °C under air pressure. Environmentally friendly growth was induced by heating a mixture of solute [Ca(NO3)2-4H2O, (NH4)2HPO4, and KOH] and flux (KNO3 and LiNO3) at 400-500 °C and holding at this temperature for 10 h. After that, the mixture was cooled at various rates of 5, 200, and >1000 "OmkT-1 (water quenching). The obtained HAp crystals, which had average sizes of up to 18.0 × 2.1 μm and aspect ratios of up to 8.6, were colorless and transparent. They had hexagonal prismatic one-dimensional (1-D) forms with pyramidal or truncated pyramidal end faces. The 1-D crystal forms and sizes were obviously dependent on the growth conditions, such as the holding temperature and the cooling rate of the high-temperature solution. High-resolution transmission electron microscopy (HR-TEM) images indicated that the grown HAp crystals were of a very good crystallinity. From the HR-TEM and X-ray diffraction, the 1-D HAp crystals, which were hexagonal cylinders ({1010} faces), elongated in the (0001) directions.

Original languageEnglish
Pages (from-to)2937-2940
Number of pages4
JournalCrystal Growth and Design
Volume9
Issue number6
DOIs
Publication statusPublished - 2009 Jun 3

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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