High temperature calorimetric study of mixing, phase separation, and crystallization in silicate glasses

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Several glass forming systems have been studied by in situ scanning calorimetry and by solution calorimetry in molten 2PbO·B2O3 at 973 K. In systems which show macroscopic glass-glass phase separation on annealing, namely K2O-La2O3-SiO2 and Li2O-SiO2, the enthalpies of solution of optically clear quenched glasses and milky annealed glasses are almost identical. This behavior, coupled with a linear variation of heat of solution with composition along joins which have a large change in overall degree of polymerization, support the contention from spectroscopy that short range clustering dominates even in nominally single phase materials, with exsolution observed as the initially present heterogeneous regions grow in size. Alkali titanosilicate melts show Cp anomalies consistent with breakdown of alkali titanate complexes or changes in Ti coordination. Calorimetry is a sensitive quantitative probe of crystallization as a function of time in both ceramic and geologic systems.

Original languageEnglish (US)
Title of host publicationCrystallization and Related Phenomena in Amorphous Materials
EditorsMatthew Libera, Tony E. Haynes, Peggy Cebe, James E. Dickinson Jr.
PublisherPubl by Materials Research Society
Pages3-11
Number of pages9
ISBN (Print)1558992200
StatePublished - 1994
Externally publishedYes
EventProceedings of the 1993 Fall Meeting of the Materials Research Society - Boston, MA, USA
Duration: Nov 29 1993Dec 2 1993

Publication series

NameMaterials Research Society Symposium Proceedings
Volume321
ISSN (Print)0272-9172

Conference

ConferenceProceedings of the 1993 Fall Meeting of the Materials Research Society
CityBoston, MA, USA
Period11/29/9312/2/93

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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