Relaxation and glass transition in an isostatically compressed diopside glass

Lothar Wondraczek, Harald Behrens, Yuanzheng Yue, Joachim Deubener, George W. Scherer

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Relaxation of isostatically compressed CaMgSi2O6 (diopside) glass is explored by ex situ differential scanning calorimetric (DSC) experiments. A diopside melt was compressed above its glass transition temperature under isostatic conditions at a pressure of 500 MPa. DSC analysis was performed at ambient pressure after slowly cooling the compressed melt under pressure (i.e., after freezing-in the densified state). Compression-induced enhancement of the overshoot in heat capacity was observed in the glass transition region. This indicates that a densified, quenched glass possesses a lower apparent fictive temperature, TfA, than a glass that was cooled under ambient pressure at the same cooling rate. However, a thermodynamic analysis indicates that the fictive temperature produced under pressure, Tf0, is actually much higher than that determined from DSC experiments at ambient pressure (Tf0>TfA).

Original languageEnglish (US)
Pages (from-to)1556-1561
Number of pages6
JournalJournal of the American Ceramic Society
Issue number5
StatePublished - May 2007

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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