Mineralogical Journal
Online ISSN : 1881-4174
Print ISSN : 0544-2540
 
Thermal changes in synthetic deuterioxyapatite
Masanori KIKUCHIAstushi YAMAZAKIMasaru AKAOHideki AOKI
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1996 Volume 18 Issue 3 Pages 79-86

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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.

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© 1996 Japan Association of Mineralogical Sciences
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