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Characterization of Silver Binding in Cryptomelane by X-ray Absorption Spectroscopy

Published online by Cambridge University Press:  10 February 2011

R. Ravikumar ,
D. W. Fuerstenau  and
G. A. Waychunas
R. Ravikumar
Affiliation:
Department of Materials Science and Mineral Engineering, University of California at Berkeley, Berkeley, CA 94720 Siemens Microelectronics Inc., 1580 Route 52, B630/Z33A, Hopewell Junction, NY 12533
D. W. Fuerstenau
Affiliation:
Department of Materials Science and Mineral Engineering, University of California at Berkeley, Berkeley, CA 94720
G. A. Waychunas
Affiliation:
Center for Materials Research, Stanford University, Stanford, CA 94305 Lawrence Berkeley National Laboratory, Earth Sciences Division, 1 Cyclotron Road, Mail Stop 90–1116, Berkeley, CA 94720
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Abstract

Using silver K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy, two different samples of silver-containing manganese oxide were analyzed in the fluorescence mode. For the first sample, silver ions from solution were sorbed onto one synthetic manganese oxide phase, namely cryptomelane (KxMn8O16, where l<x<2). The second sample was a silvermanganese oxide from Colorado. From the EXAFS analysis, silver was found to occupy two different sites in the synthetic sample. The natural samples from Colorado also exhibited a very similar coordination distances as the synthetic samples. In the low temperature spectrum of the synthetic sample at 10 K, the Ag-O peak was found to be missing and the amplitude of the Ag- Ag peak was approximately three times larger than the corresponding room temperature sample.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 524: Symposium V – Application of Synchrotron Radiation Techniques…IV , 1998 , 353
Copyright
Copyright © Materials Research Society 1998

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References

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