Pressure Induced Hydrogen Bonding

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9506483 Parise This research will elucidate the factors that determine the strength of the H-bond in hydrous minerals and its effects on structure, phase transition behavior and elasticity. The research approach will systematically isolate such factors as cation acidity, pressure and temperature as variables in a compound's ability to form hydrogen bonds and to determine crystal structure and elasticity as a function of these variables. Studies will include structural measurements of dihydroxides at high pressure using in situ neutron and x-ray measurements, elasticity property measurements of the B series of high pressure hydrous phases using Brillouin scattering, and measurement of equations of state and dehydration behavior of these compounds and chlorite by in situ x-ray diffraction measurements.