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Surface Chemistry of Fe Oxide Impregnated Porous Vycor Glass

Published online by Cambridge University Press:  15 February 2011

D. Sunil ,
H. Rafailovich ,
C. Sokolov ,
H. D. Gafney ,
S. A. Schwarz  and
B. J. Wilkens
D. Sunil
Affiliation:
Physics and Chemistry Department,Queens College,Flushing,N.Y.11367.
H. Rafailovich
Affiliation:
Physics and Chemistry Department,Queens College,Flushing,N.Y.11367.
C. Sokolov
Affiliation:
Physics and Chemistry Department,Queens College,Flushing,N.Y.11367.
H. D. Gafney
Affiliation:
Physics and Chemistry Department,Queens College,Flushing,N.Y.11367.
S. A. Schwarz
Affiliation:
Bellcore,Red Bank NJ.07701-7040.
B. J. Wilkens
Affiliation:
Bellcore,Red Bank NJ.07701-7040.
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Abstract

X-ray absorption and Mossbauer spectroscopy were used to study chemical and magnetic properties of photodeposited Fe in Porous Vycor Glass(PVG). Extended X-ray Absorption Fine Structure(EXAFS) measurements of Fe samples show that after photolyzation, the Fe atoms are surrounded by two shells of six oxygen atoms and eight Fe atoms. The Fe-O and Fe-Fe distances are 1.84 °A and 1.99 °A respectively. After heating to 650 °C and 1200 °C shortening of bond lengths are observed. The second shell of Fe in unheated and heated to 650 °C samples have Fe-Fe distances of 3.0 °A and 2.98 °A respectively. Samples consolidated at 1200 °C show the Fe atoms to be surrounded by two shells of Fe atoms at 2.86 and 3.03 °A. This data together with Mossbauer and XANES spectra suggest that Fe exists in two different configrations, one is an Fe-Fe compound and the other is an octahedral Fe oxide similar to Fe2O3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 244: Symposium J – Optical Waveguide Materials , 1991 , 363
Copyright
Copyright © Materials Research Society 1992

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References

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