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.
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Translated from Novye Ogneupory, No. 10, pp. 52 – 56, October, 2013.
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Putlyaev, V.I., Kukueva, E.V., Safronova, T.V. et al. Features of Octacalcium Phosphate Thermolysis. Refract Ind Ceram 54, 420–424 (2014). https://doi.org/10.1007/s11148-014-9624-0
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DOI: https://doi.org/10.1007/s11148-014-9624-0