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Arzigian, James Simon 2015-05-13T15:22:21Z 2015-05-13T15:22:21Z 10000-01-01 1980 1980 The diffusion coefficient of silver in silver rubidium iodide (RbAg(,4)I(,5)) has been measured in both superionic phases using radiotracer Ag-110m and serial sectioning with a low temperature sectioning apparatus. The activation energies for diffusion in alpha-RbAg(,4)I(,5) and beta-RbAg(,4)I(,5), respectively, are .11 (+OR-) .01 eV and .20 (+OR-) .04 eV. These values are the same, within experimental error, as the observed activation energies for conduction. An isotope effect for diffusion has also been measured in both superionic phases. Ag-105 and Ag-110m radioisotopes were used with gamma spectroscopy and energy discrimation. The effect is small, with no significant temperature variation, with the value at 333 K being .12 (+OR-) .01. The second-order phase transition at 208 K has a small effect, if any, on the magnitude of the effect. The data suggest that a highly cooperative transport mechanism is responsible for the unsually high values of both the conductivity and diffusion coefficient. Although it is not possible to deduce the particular mechanism involved, theories involving ionic polarons, or cooperative motion, such as crowdions or solitons, seem consistent with the observed results. Made available in DSpace on 2015-05-13T15:22:21Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8108438.PDF: 1782149 bytes, checksum: ea22a297bec07b5fe7459c7da05c42b1 (MD5) Previous issue date: 1980 Embargo set by: Seth Robbins for item 78402 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 81 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1980. http://hdl.handle.net/2142/77191 (UMI)AAI8108438 eng Physics, Condensed Matter Silver Diffusion and Isotope Effect in Silver-Rubidium-Iodide text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.