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The Nature of the Paramagnetic States in SiO2-GeO2-Sol-Gel Glasses

Published online by Cambridge University Press:  25 February 2011

George Kordas  and
S. P. Mukherjee
George Kordas
Affiliation:
Vanderbilt University, Mechanical and Materials Engineering, Nashville, TN
S. P. Mukherjee
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA
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Abstract

The 9.5 GHz ESR-spectra of gamma-ray irradiated 94 SiO2 6 GeO2 (mol%) aero gels heat treated at 462°C were recorded at 300 K. The ESR-spectrum of this gel consisted of an asymmetric line (g1 = 2.001, g2 = 1.995, and g3 = 1.994) attributed to the Ge(3)-center and other components which have not yet been identified. The 94 SiO2 6 GeO2 gel was treated at 1000 and 1280°C and then exposed to gamma-ray radiation. The Ge(1)- and Ge(3)-centers were identified in the 94 SiO2 6 GeO2 gel with TH = 1000°C. At TH = 1280°C the signal of the Ge(1)-center dominated the spectrum of this sample. The spectra of the 58 SiO2 42 GeO2 gels with TH = 1200 and 1400°C can be described by the Ge(3)-center. The Ge(1)-center was of minor importance in these samples.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 61: Symposium P – Defects in Glasses , 1985 , 413
Copyright
Copyright © Materials Research Society 1986

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