Mechanochemical transformation of mixtures of Ca(OH)2 and (NH4)2HPO4 or P2O5 |
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| Affiliation: | 1. Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India;2. Homi Bhabha National Institute, Mumbai, India;1. College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China;2. Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, Hangzhou Normal University, Hangzhou 310036, China;1. CSIR-Institute of Minerals & Materials Technology, Bhubaneswar 751013, Odisha, India;2. Academy of Scientific and Innovative Research, New Delhi 110001, India;1. I.P. Bardin Science Institute for Ferrous Metallurgy, Radio st. 23/9, Moscow 105005, Russia;2. Moscow Technological University, “MIREA”, Vernadskiy av. 78, Moscow 119454, Russia;3. National University of Science and Technology “MISIS”, Leninskiy av. 4, Moscow 119049, Russia;1. Institute of Chemical Research of Catalonia (ICIQ), Ave. Paisos Catalans 16, 43007 Tarragona, Spain;2. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Ave. Camilo José Cela 12, 13005 Ciudad Real, Spain |
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| Abstract: | A detailed comparative study of the mechanochemical transformation of two mixtures: Ca(OH)2–(NH4)2HPO4 and Ca(OH)2–P2O5, milled in a mortar dry grinder for different periods of time was carried out. The phase transformations obtained at each milling stage were studied by X-ray diffraction, infrared spectroscopy, transmission electron microscopy, differential scanning calorimetry and thermogravimetric analysis.The transformations taking place during the first periods of milling are very different for both mixtures. However, prolonged milling, over nearly the same period, causes amorphization of both mixtures. DSC analysis of the milled powders showed the temperature of crystallization of hydroxyapatite and tricalcium phosphate (β-TCP). Calcinations of all the different milled powders at 800 °C for 2 h, results in the formation of hydroxyapatite and β-TCP. |
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