Glass transition Tg and thermal expansion in glassy materials measured by time-resolved x-ray diffraction

K. Ota, K. Hajlaoui, G. Vaughan, M. Di Michiel, D. V. Louzguine, A. Inoue, A. R. Yavari

Research output: Contribution to journalArticlepeer-review


We have determined changes in thermal expansion coefficient αth and relaxation behavior of glassy materials by monitoring the first maximum of the diffraction pattern, obtained in transmission during in-situ heating in a high-intensity high-energy monochromatic light beam. The excess quenched-in free-volume ΔVf and its relaxation kinetics can also be determined. Like metallic glasses, oxide glasses also show the glass transition Tg with excess free-volume trapped during cooling. The results allow quantitative determination of Tg by diffraction that compares well with Tg obtained by calorimetry as was previously reported for metallic glasses and the relaxation of excess free volume.

Original languageEnglish
Pages (from-to)225-228
Number of pages4
JournalJournal of Metastable and Nanocrystalline Materials
Publication statusPublished - 2005


  • Amorphisation
  • Amorphous materials
  • Free volume
  • Glass transition
  • Liquid quenching
  • Synchrotron radiation
  • Thermal analysis
  • Thermal expansion

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Materials Science(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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