Features of Octacalcium Phosphate Thermolysis

Features of Octacalcium Phosphate Thermolysis Octacalcium phosphate (OCP) is synthesized by pyrolysis of brushite CaHPO4 · H2O in an acetate buffer solution at 60 °C and pH = 7.5. OCP thermolysis is performed in the range 200 – 700 °C. The starting OCP and powder obtained is studied by IR-spectroscopy, electron microscopy, and x-ray-phase analyses. Thermolysis of OCP, prepared by this method proceeds at higher temperature than provided in publications. It is demonstrated for the first time in this work that the main feature of OCP thermolysis is formation of an intermediate apatite-like phase having within its composition, apart from orthophosphate and hydroxide ions, also pyrophosphate ions. Crystals of this intermediate phase retain the original OCPlamellar morphology entirely. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

Features of Octacalcium Phosphate Thermolysis

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Publisher
Springer US
Copyright
Copyright © 2014 by Springer Science+Business Media New York
Subject
Material Science; Characterization and Evaluation of Materials; Materials Science, general; Ceramics, Glass, Composites, Natural Methods
ISSN
1083-4877
eISSN
1573-9139
D.O.I.
10.1007/s11148-014-9624-0
Publisher site
See Article on Publisher Site

Abstract

Octacalcium phosphate (OCP) is synthesized by pyrolysis of brushite CaHPO4 · H2O in an acetate buffer solution at 60 °C and pH = 7.5. OCP thermolysis is performed in the range 200 – 700 °C. The starting OCP and powder obtained is studied by IR-spectroscopy, electron microscopy, and x-ray-phase analyses. Thermolysis of OCP, prepared by this method proceeds at higher temperature than provided in publications. It is demonstrated for the first time in this work that the main feature of OCP thermolysis is formation of an intermediate apatite-like phase having within its composition, apart from orthophosphate and hydroxide ions, also pyrophosphate ions. Crystals of this intermediate phase retain the original OCPlamellar morphology entirely.

Journal

Refractories and Industrial CeramicsSpringer Journals

Published: Mar 13, 2014

References

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