Investigation of setting reaction of magnesium-potassium phosphate ceramics by qualsi-elastic neutron scattering
Mg-K phosphate ceramics are chemically-bonded ceramics. They are attractive binders for many applications. They harden at room temperature through an acid-base aqueous reaction between magnesium oxide and a potassium phosphate. Several mechanisms for this reaction have been proposed, but kinetic studies are scarce and none of them provided quantitative data. The rate of MgO dissolution (which depends mainly on the calcination temperature of magnesium carbonate from which it is obtained) is considered the main factor controlling the reaction process. Recently, we showed that an amorphous fraction develops as a precursor of the crystalline product. Synchrotron diffraction allowed us to derive kinetic data and formulate hypothesis on the reaction mechanism. This interpretation needs to be confirmed and issues such as the nature of the intermediate (amorphous ?) precursor still deserves explanation. To this aim, complementing already planned calorimetric and SAXS experiments, we would like to investigate for the first time the reaction using quasielastic neutron scattering in order to derive kinetic parameters and study the chemical state of water in this system.
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VIANI Alberto; GUALTIERI Alessandro; POLLASTRI Simone and ZBIRI Mohamed. (2015). Investigation of setting reaction of magnesium-potassium phosphate ceramics by qualsi-elastic neutron scattering. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-04-137