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• W2018243669 abstract "The temperature-programmed dehydration of several near-stoichiometric hydroxyapatites from aqueous medium has been investigated over the range from 20 to 700°C at constant heating rate. In most of this work the sample was subjected to a vacuum of the order of 10−6 to 10−7 Torr and the effluent water vapor was detected by a mass spectrometer. We shall designate this as the MTA procedure. We find two major peaks in the MTA spectra for all these samples from aqueous medium. The first, at 90–100°C, is attributed to desorption of reversibly adsorbed water on the external surfaces; and the second, at 225–260°C, we attribute to the irreversible removal of water from ultrafine pores in the solid. The MTA technique has been employed to demonstrate that hydroxyapatite in the hydrated state undergoes H2O2O exchange when soaked in heavy water. This applies to both the 90–100°C peaks and the 225–260°C peaks. It is suggested that the considerable variation in the peak temperatures observed over the higher range from 221 to 257°C may be attributed to a difference in pore diameters, and that we must attain a higher temperature to empty a narrower pore." @default.
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• W2018243669 date "1979-06-01" @default.
• W2018243669 modified "2023-09-27" @default.
• W2018243669 title "Temperature-programmed dehydration of hydroxyapatite" @default.
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• W2018243669 doi "https://doi.org/10.1016/0021-9797(79)90002-x" @default.
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