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Features of Octacalcium Phosphate Thermolysis

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Refractories and Industrial Ceramics Aims and scope

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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Authors and Affiliations

  1. Materials Science Faculty, M. V. Lomonosov Moscow State University, Moscow, Russia

    V. I. Putlyaev, E. V. Kukueva, T. V. Safronova & V. K. Ivanov

  2. Chemistry Faculty, M. V. Lomonosov Moscow State University, Moscow, Russia

    V. I. Putlyaev, T. V. Safronova & B. R. Churagulov

  3. FGBUN N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Science, Moscow, Russia

    V. K. Ivanov

Authors
  1. V. I. Putlyaev
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  2. E. V. Kukueva
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  3. T. V. Safronova
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  4. V. K. Ivanov
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  5. B. R. Churagulov
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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

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