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X-Ray Absorption Analysis of Ge and Ga Environments in Ba-Gallogermante Glasses

Published online by Cambridge University Press:  15 February 2011

Celia I. Merzbacher
Affiliation:
Optical Sciences Division, Naval Research Laboratory, Washington, DC 20375
David A. McKeown
Affiliation:
Chemistry Department, Howard University, Washington, DC 20059
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Abstract

X-ray absorption spectroscopy has been used to characterize the local structure surrounding Ga and Ge in BaO-Ga2O3-GeO2 glasses. Based on comparisons with results for crystalline standards of known structure, Ge and Ga in all of the glasses are primarily in tetrahedral coordination; no evidence for octahedral coordination is observed. Bond length and coordination values derived from fitting calculations are fairly uniform for all glasses, however disorder increases with increase in BaO and decrease in GeO2 content, especially in the second shell surrounding Ge and Ga. Ge absorption edges for all glasses resemble smoothed BGG-An or GeO2 [quartz] edges. Ga absorption edges of the glasses also resemble the BGG-An edge which has two edge maxima, but in the glasses the relative intensities of the two maxima vary with composition.

Type
Research Article
Copyright
Copyright © Materials Research Society 1993

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References

REFERENCES

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