Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.2273s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 60, Issue 13, pp.2273-2282
Physics
15
Scientific paper
The first direct measurements over a range of temperatures from 25-350°C are reported for cation-oxygen (water) distances in aqueous solutions at equilibrium saturated vapour pressures. The silver-oxygen (first shell water) bond lengths in AgNO 3 and AgClO 4 solutions were obtained using extended X-ray absorption fine structure (EXAFS) measurements on the silver K-edge. At 25°C and 1 bar, the Ag + ion is coordinated by four inner sphere water ligands with an average silver-oxygen distance of 2.32 (±0.01) Å. With increasing temperature to 350°C, the silver-oxygen (H 2 O) bond length decreases by about 0.10 (±0.01) Å and the coordination number decreases from 4 to ~3. The Debye-Waller factors remain approximately constant with increasing temperature. Silver-nitrate ion pairing (as AgNO 0 3 ) was observed only at 200 and 300°C in an 0.10 AgNO 3 /3.00 m HNO 3 solution for which the silver-nitrogen (nitrate) distances of 3.24 and 3.27 Å, respectively, were obtained.
Charnock John M.
Dobson B. R.
Henderson M. B. C.
Seward Terry M.
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