Effects of Preparation Conditions in Aqueous Solution on Properties of Hydroxyapatites

Kunio Ishikawa, Masayuki Kon, Norihiko Kuwayama, Satoru Tenshin

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Hydroxyapatite powders (HAP: Ca10(PO4)6(OH)2) were prepared from calcium nitrate and di-ammonium hydrogen phosphate at various temperatures in aqueous solution in the absence and presence of carbon dioxide. In the absence of carbon dioxide, the crystallinities as well as the calcium to phosphate ratio (Ca/P ratio) of HAP powders increased with an increase in the preparation temperature. Calcium ion deficiency caused low Ca/P ratios of HAP powders. Such HAP powders decomposed thermally to α-tricalcium phosphate (α-TCP : Ca3(PO4)2) at 800 °C in 3 hours whereas HAP powders with sufficient calcium were stable at 1200 °C for 3 hours. In the presence of carbon dioxide as well the crystallinities of HAP powders increased with an increase in the preparation temperature, but carbonate-bearing HAPs were obtained instead of pure HAP. In addition, calcium carbonate was obtained along with carbonate-bearing HAP prepared below 60 °C.

Original languageEnglish
Pages (from-to)58-69123
Number of pages69066
Journaldental materials journal
Volume9
Issue number1
DOIs
Publication statusPublished - 1990
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Dentistry(all)

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