Thermal changes in synthetic deuterioxyapatite.

• KIKUCHI Masanori

  Department of Mineral Resources Engineering, School of Science and Engineering, Waseda University

• YAMAZAKI Astushi

  Department of Mineral Resources Engineering, School of Science and Engineering, Waseda University

• AKAO Masaru

  Division of Inorganic Materials, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University

• AOKI Hideki

  Division of Inorganic Materials, Institute for Medical and Dental Engineering, Tokyo Medical and Dental University

Abstract

Deuterioxyapatite (Ca₁₀(PO₄)₆(OD)₂, DAp) was prepared from CaO, P₂O₅, and D₂O in H₂O and CO₂ free air at 298K. The obtained DAp was identified as apatite single phase by a powder XRD technique. The deuterioxyl group was found by IR and MAS-NMR techniques, but hydroxyl group was not. Further, MAS-NMR measurement suggested the DAp had no tightly-bonded OD group. The deuterioxyl group was not substituted with hydroxyl group at 298K by stirring in distilled water for 7 days. From TG-MS measurement, dried DAp powder released deuterium in two rapid steps and in a slow step up to 873K. High-temperature XRD measurement showed large thermal expansion for DAp due to lattice defect led by heating. High-temperature IR spectra showed release of deuterioxyl group without substitution by hydroxyl group above 333K. Deuterioxyl group in DAp was easily released by heating, and DAp changed into oxyapatite.

Journal

• Mineralogical Journal

  Mineralogical Journal 18 (3), 79-86, 1996

  Japan Association of Mineralogical Sciences

Keywords

• General Earth and Planetary Sciences
• General Environmental Science

Details

• CRID: 1390282681522691584
• NII Article ID: 10008772644
• NII Book ID: AA00739590
• DOI: 10.2465/minerj.18.79
• ISSN: 18814174
• ISSN: 05442540
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed