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Evidence of Silica Polymerization During Internal Nucleation of Glassy Lithium Disilicate

Published online by Cambridge University Press:  15 February 2011

Jane W. Adams  and
Bernard H.W.S. De Jong
Jane W. Adams
Affiliation:
Center for Ceramic Research, Rutgers University, Piscataway, NJ 08855–0909
Bernard H.W.S. De Jong
Affiliation:
Institute for Earth Sciences and Vening Meinesz Institute for Geodynamic Research, Utrecht University, 3508TA Utrecht, the Netherlands
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Abstract

The principal problem in developing a theory of internal nucleation lies in the constitution of the nascent nuclei. To get at this constitution in an internally nucleating glass, oxygen and lithium core level x-ray photoelectron spectra have been measured on glassy and nucleated lithium disilicate and on the three stable crystalline compounds in the Li2O-SiO2 system. Our results indicate that nucleated lithium disilicate glass consists of completely polymerized silica in the formation of which non-bridging oxygens are consumed. During this silica polymerization lithium atoms move away from presumably four-fold coordinated sites towards higher coordinated ones.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 321: Symposium E – Crystallization and Related Phenomena in Amorphous Materials—Ceramics, Metals, Polymers, and Semiconductors , 1993 , 239
Copyright
Copyright © Materials Research Society 1994

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