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In Situ Monitoring of Mechanochemical Synthesis of Calcium Urea Phosphate Fertilizer Cocrystal Reveals Water-Based Autocatalysis
preprintsubmitted on 22.08.2019, 17:41 and posted on 26.08.2019, 15:28 by Patrick Julien, Luzia S. Germann, Hatem M. Titi, Martin Etter, Robert E. Dinnebier, Lohit Sharma, Jonas Baltrusaitis, Tomislav Friscic
Using the mechanosynthesis of the calcium phosphate and urea fertilizer cocrystal as a model, we provide the first in situ investigation of autocatalysis in a mechanochemical reaction. The application of in situ Raman spectroscopy and synchrotron X-ray diffraction provided the first direct evidence of a mechanochemical system in which a reaction product (water) mediates the rate of transformation and underpins positive feedback kinetics.