Thermal changes in synthetic deuterioxyapatite

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Author(s)

    • KIKUCHI Masanori
    • Department of Mineral Resources Engineering, School of Science and Engineering, Waseda University
    • YAMAZAKI Astushi
    • 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 (Ca<SUB>10</SUB>(PO<SUB>4</SUB>)<SUB>6</SUB>(OD)<SUB>2</SUB>, DAp) was prepared from CaO, P<SUB>2</SUB>O<SUB>5</SUB>, and D<SUB>2</SUB>O in H<SUB>2</SUB>O and CO<SUB>2</SUB> 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, 1996-07-01

    Japan Association of Mineralogical Sciences

References:  10

Codes

  • NII Article ID (NAID)
    10008772644
  • NII NACSIS-CAT ID (NCID)
    AA00739590
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    05442540
  • Data Source
    CJP  J-STAGE 
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