Volume relaxation in a borosilicate glass hot compressed by three different methods

Linfeng Ding, Karan Doss, Yongjian Yang, Kuo-Hao Lee, Michal Bockowski, Sylvie Demouchy, Manuel Thieme, Benedikt Ziebarth, Qingwei Wang*, Morten Mattrup Smedskjær, John C. Mauro*

*Corresponding author

Research output: Contribution to journalJournal articleResearchpeer-review


The temperature dependence of glass relaxation has been intensively studied; however, the effect of an imposed pressure history on relaxation behavior is poorly understood. In this study, we subjected SCHOTT N-BK7® borosilicate glasses to isostatic compression in a Paterson press (PP) and a gas pressure chamber (GPC). The pressure ranged from 0.1 GPa to 2 GPa for various dwell temperatures and times near the glass transition region. Comparison with our recent results on the same glass using the piston-cylinder apparatus (PC, 0.5-1.5 GPa) reveals that the density of a glass, which has been quenched from the equilibrium state under high pressure at 2 K/min (pressure quench), increases approximately linearly with increasing pressure up to 2 GPa. Considering the volume recovery results at ambient pressure, we assert that the preceding high-pressure treatment in PC (uniaxial loading) generates a similar isostatic pressure effect on N-BK7 glass as those of PP and GPC treatments. Finally, we verify the previously proposed two-internal-parameter relaxation model on the volume recovery data using the three different compression methods. With a new set of parameters in the model, we can account for the pressure and temperature dependence of volume relaxation even for the samples quenched from nonequilibrium states at high pressure.

Original languageEnglish
JournalJournal of the American Ceramic Society
Issue number2
Pages (from-to)816-823
Number of pages8
Publication statusPublished - Feb 2021


  • borosilicate glass
  • densification
  • fictive pressure
  • fictive temperature
  • volume relaxation

Fingerprint Dive into the research topics of 'Volume relaxation in a borosilicate glass hot compressed by three different methods'. Together they form a unique fingerprint.

Cite this