Browsing by Author "Vaughan D.J."
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Browsing by Author "Vaughan D.J."
Now showing items 1-13 of 13
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Parkman R.H.; Charnock J.M.; Livens F.R.; Vaughan D.J. (1998)The interaction of Sr2+ ions in aqueous solution with the surfaces of calcite and kaolinite have been studied by exposing powdered samples of these minerals to solutions containing a range of dissolved Sr2+ concentrations. ...
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Parkman R.H.; Charnock J.M.; Livens F.R.; Vaughan D.J. (1998)The interaction of Sr2+ ions in aqueous solution with the surfaces of calcite and kaolinite have been studied by exposing powdered samples of these minerals to solutions containing a range of dissolved Sr2+ concentrations. ...
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Yin Q.; Kelsall G.H.; Vaughan D.J.; England K.E.R. (1995)Atmospheric and electrochemical oxidation of the surface of chalcopyrite has been investigated using electrochemical techniques with subsequent surface analysis by X-ray photoelectron spectroscopy (XPS) and aqueous phase ...
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Pattrick R.A.D.; van Der Laan G.; Henderson Michael B.C.M.B.; Kuiper P.; Dudzik E.; Vaughan D.J. (2002)X-ray magnetic circular dichroism (XMCD) is an element-, site- and symmetry-selective spectroscopic technique that has the potential to provide quantitative information on site occupancies in ferri- and ferro-magnetic ...
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Di Benedetto F.; Bernardini G.P.; Costagliola P.; Plant D.; Vaughan D.J. (2005)A series of natural sphalerite samples, characterized by an inhomogeneous (zonal) distribution of Fe, Mn, and Cd atoms substituting for Zn, has been investigated by electron probe micro analysis and X-ray element distribution ...
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Farquhar M.L.; Vaughan D.J.; Hughes C.R.; Charnock J.M.; England K.E.R. (1997)The interactions between each of the metal ions copper(II), cadmium(II), and lead(II) in aqueous solution and the surfaces of the minerals muscovite, biotite, and perthitic feldspar have been studied using batch sorption ...
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MECHANISM OF MOLYBDENUM REMOVAL FROM THE SEA AND ITS CONCENTRATION IN BLACK SHALES: EXAFS EVIDENCE Helz G.R.; Miller C.V.; Charnock J.M.; Mosselmans J.F.W.; Pattrick R.A.D.; Garner C.D.; Vaughan D.J. (1996)Molybdenum K-edge EXAFS (extended X-ray absorption fine structure) spectra yield new structural information about the chemical environment of Mo in high-Mo black shales and sediments. Two spectral types are found. The less ...
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Helz G.R.; Tossell J.A.; Charnock J.M.; Pattrick R.A.D.; Vaughan D.J.; Garner David C. (1995)Bond distances, vibrational frequencies, gas-phase energetics, and proton affinities for various thioarsenite molecules and ions are predicted from molecular orbital theory and used to interpret EXAFS and Raman spectra of ...
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Helz G.R.; Tossell J.A.; Charnock J.M.; Pattrick R.A.D.; Vaughan D.J.; Garner C.D. (1995)Bond distances, vibrational frequencies, gas-phase energetics, and proton affinities for various thioarsenite molecules and ions are predicted from molecular orbital theory and used to interpret EXAFS and Raman spectra of ...
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Rimstidt J.D.; Vaughan D.J. (2003)The oxidation of pyrite to release ferrous iron and sulfate ions to solution involves the transfer of seven electrons from each sulfur atom in the mineral to an aqueous oxidant. Because only one or, at most, two electrons ...
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Becker U.; Hochella M.F.; Vaughan D.J. (1997)In order to evaluate the thermodynamics and reaction mechanisms of the adsorption and reduction of gold on galena surfaces, reaction energies were calculated for the adsorption of AuCl-4 from solution and for the stepwise ...
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Pattrick R.A.D.; Mosselmans J.F.W.; Charnock J.M.; England K.E.R.; Helz G.R.; Garner C.D.; Vaughan D.J. (1997)X-ray absorption (XAS) and X-ray photoelectron spectroscopy (XPS) analysis of copper sulfide precipitated from aqueous solution at ambient temperatures reveals the existence of a metastable primitive structure that ages ...
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Yong C.W.; Warren M.C.; Vaughan D.J.; Hillier I.H. (2003)The adsorption of alkali metal cations on a hydroxylated corundum surface was investigated using high-level electronic structure calculations, with both cluster Hartree–Fock and periodic density-functional theory approaches. ...
Now showing items 1-13 of 13