On the persistence of metastable crystal phases in lithium disilicate glass

Lori L. Burgner, Pierre Lucas, Michael C. Weinberg, Paulo C. Soares, Edgar D. Zanotto

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The formation of metastable crystalline phases in lithium disilicate glass has been a subject of controversy for decades. Recent experimental results mainly obtained via the use of electron microscopy have provided strong evidence for the formation of metastable phases during the early stages of crystallization in this composition, and have initiated a re-examination of this topic. Here, we discuss one aspect of this problem relating to the stability of these non-equilibrium phases when glasses are heated for extended time periods (>100 h) at temperatures in the nucleation regime. Recently, we presented experimental evidence obtained via XRD which indicated that metastable phases do not persist at long times in lithium disilicate glass. This finding is in direct contradiction to a result reported earlier which suggests that metastable crystalline phases in lithium disilicate glasses are long-lived and can be detected with the aid of XRD. Presented herein are the results of a systematic experimental investigation addressing the potential sources of this discrepancy, namely, glass preparation procedure, glass composition, and water content. Consistent with the results of our previous investigation, in no instance do we find any XRD evidence for the persistence of metastable phases.

Original languageEnglish (US)
Pages (from-to)188-194
Number of pages7
JournalJournal of Non-Crystalline Solids
Volume274
Issue number1
DOIs
StatePublished - Sep 2000
Externally publishedYes

Fingerprint

Lithium
lithium
Glass
Crystals
Metastable phases
glass
crystals
Crystalline materials
Crystallization
Chemical analysis
Water content
Electron microscopy
moisture content
lithia disilicate
electron microscopy
Nucleation
examination
nucleation
crystallization
preparation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

On the persistence of metastable crystal phases in lithium disilicate glass. / Burgner, Lori L.; Lucas, Pierre; Weinberg, Michael C.; Soares, Paulo C.; Zanotto, Edgar D.

In: Journal of Non-Crystalline Solids, Vol. 274, No. 1, 09.2000, p. 188-194.

Research output: Contribution to journalArticle

Burgner, Lori L. ; Lucas, Pierre ; Weinberg, Michael C. ; Soares, Paulo C. ; Zanotto, Edgar D. / On the persistence of metastable crystal phases in lithium disilicate glass. In: Journal of Non-Crystalline Solids. 2000 ; Vol. 274, No. 1. pp. 188-194.
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