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In situ Fe K-edge X-ray absorption fine structure of a pyrite electrode in a Li/polyethylene oxide (LiClO{sub 4})/FeS{sub 2} battery environment

Description: Electronic and structural properties of materials generated by the reduction and subsequent oxidation of pyrite in a lithium-based solid polymer electrolyte have been examined by in situ fluorescence Fe K-edge X-ray absorption fine structure (XAFS) in a FeS{sub 2}/Li battery environment. The XAFS results obtained are consistent with the formation of metallic iron as one of the products of the full (4-electron) discharge, in agreement with information reported in other laboratories. Extended X-r… more
Date: December 31, 1996
Creator: Totir, D.; Bae, I.T.; Hu, Y.; Scherson, D.A. & Antonio, M.R.
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Partner: UNT Libraries Government Documents Department
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In situ X-ray absorption fine structure studies of a manganese dioxide electrode in a rechargeable MnO{sub 2}/Zn alkaline battery environment

Description: Electronic and structural aspects of a MnO{sub 2} electrode in a rechargeable MnO{sub 2}/Zn battery environment have been investigated by in situ Mn K-edge X-ray absorption fine structure (XAFS). The relative amplitudes of the three major Fourier transform shells of the EXAFS (extended XAFS) function of the rechargeable MnO{sub 2} electrode in the undischarged state were found to be similar to those found for ramsdellite, a MnO{sub 2} polymorph with substantial corner-sharing linkages among the… more
Date: December 31, 1996
Creator: Mo, Y.; Hu, Y.; Bae, I.T.; Miller, B.; Scherson, D.A. & Antonio, M.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Implications of the unusual redox behavior exhibited by the teteropolyanion [EuP{sub 5}W{sub 30}O{sub 110}]{sup 12-}

Description: We report on the novel electrochemical behavior of the heteropolyanion [EuP{sub 5}W{sub 30}O{sub 110}]{sup -12}, with emphasis on the Eu valence in both the oxidized and reduced forms. In aqueous electrolytes, the P-W-O framework is electroactive and can reversibly accept up to 10 electrons before the potential becomes reducing enough for H{sub 2} evolution. Eu L{sub 3}-edge x-ray absorption near edge structure (XANES) results demonstrate that Eu is also electroactive under the same conditions.… more
Date: December 1996
Creator: Antonio, M. R. & Soderholm, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Extracellular iron-sulfur precipitates from growth of Desulfovibrio desulfuricans

Description: The authors have examined extracellular iron-bearing precipitates resulting from the growth of Desulfovibrio desulfuricans in a basal medium with lactate as the carbon source and ferrous sulfate. Black precipitates were obtained when D. desulfuricans was grown with an excess of FeSO{sub 4}. When D. desulfuricans was grown under conditions with low amounts of FeSO{sub 4}, brown precipitates were obtained. The precipitates were characterized by iron K-edge XAFS (X-ray absorption fine structure), … more
Date: December 20, 1999
Creator: Antonio, M. R.; Tischler, M. L. & Witzcak, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The influence of desulfovibrio desulfuricans on neptunium chemistry.

Description: The role of biotic Np(V) reduction is studied in light of its potential role in the environmental immobilization of this hazardous radionuclide. The speciation of Np in Desulfovibrio desulfuricans cultures is compared with Np speciation in the spent medium and in the uninoculated medium. Precipitates formed in all three samples. Optical spectroscopy and X-ray absorption near edge structure (XANES) were used to determine that Np(V) is almost quantitatively reduced in all three samples and that t… more
Date: December 20, 1999
Creator: Soderholm, L.; Williams, C.; Antonio, M. R.; Tischler, M. L. & Markos, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Synthesis and properties of lanthanide-exchanged Preyssler`s heteropolyanions

Description: Na{sup +} in the Preyssler heteropolytungstate anion [NaP{sub 5}W{sub 30}O{sub 110}]{sup 14{minus}} can be exchanged for a trivalent lanthanide ion. The potential significance of this new class of lanthanide heteropolyanions relates to their applications in catalysis science. This view follows from the fact that Keggin heteropolyanions and their free acids are used as heterogeneous solid catalysts and homogeneous solution catalysts. The authors describe synthetic conditions that lead to the inc… more
Date: December 1994
Creator: Antonio, M. R.; Malinsky, J. & Soderholm, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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