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High Temperature Calorimetric Study of Mixing, Phase Separation,and Crystallization in Silicate Glasses

Published online by Cambridge University Press:  15 February 2011

Alexandra Navrotsky
Alexandra Navrotsky*
Affiliation:
Department of Geological and Geophysical Sciences and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544.
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Abstract

Several glass forming systems have been studied by in situ scanningcalorimetry and by solution calorimetry in Molten 2PbO.B2O3 at 973 K. In systems which showmacroscopic glass-glass phase separation on annealing, namely K2O-La2O3-SiO2 and Li2O-SiO2, the enthalpies of solution of opticallyclear quenched glasses and milky annealed glasses are almost identical. Thisbehavior, coupled with a linear variation of heat of solution withcomposition along joins which have a large change in overall degree ofpolymerization, support the contention from spectroscopy that short rangeclustering dominates even in nominally single phase Materials, withexsolution observed as the initially present heterogeneous regions grow insize. Alkali titanosilicate melts show Cp anomalies consistentwith breakdown of alkali titanate complexes or changes in Ti coordination.Calorimetry is a sensitive quantitative probe of crystallization as afunction of time in both ceramic and geologic systems.

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 , 3
Copyright
Copyright © Materials Research Society 1994

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References

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