Structure of Geological Fluids
We propose to make the first investigation by using neutron diffraction and isotope substitution of an aqueous ionic solution at pressures beyond 0.2 GPa. The focus of attention will be on a concentrated solution of 4.41 molal NiCl2 in D2O under the same state conditions for which we have already examined the structure of pure D2O i.e. at pressures ranging from 0.1 to 2.5 GPa at a temperature of 150 deg C. Use of the first difference method will eliminate those pair correlation functions that do not involve the Ni2+ aqua-ion, along with the main contributions from inelastic scattering. The results will therefore provide the first detailed account on how the coordination environment of an aqua-ion varies over an extensive range of pressure and will have relevance for the mineral trapping of CO2. Success will lead to the possibility of investigating other aqueous ionic solutions of geochemical importance.
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SALMON Philip Stephen; Henry E. Fischer; KLOTZ Stefan; PIZZEY Keiron; ROWLANDS Ruth and ZEIDLER Anita. (2013). Structure of Geological Fluids. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-02-502
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