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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
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Published on: January 26, 2016

Reversible atomic processes as basic mechanisms of the glass transition.

Feng Ye1, Wolfgang Sprengel, Rainer K Wunderlich

  • 1Institut für Theoretische und Angewandte Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany. yefeng@skl.ustb.edu.cn

Proceedings of the National Academy of Sciences of the United States of America
|August 1, 2007
PubMed
Summary

Researchers directly observed reversible vacancy defects in Zr57Cu15.4Ni12.6Nb5Al10 glass. Vacancy migration is temperature-dependent, impacting glass properties and amorphous steel development.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Amorphous Materials

Background:

  • Understanding defects in amorphous materials is crucial for predicting properties.
  • Amorphous alloys, like Zr-based bulk metallic glasses, exhibit unique characteristics.
  • Defect kinetics influence material behavior, including viscosity and structural stability.

Purpose of the Study:

  • To directly evidence the reversible formation and disappearance of vacancy-type defects in bulk Zr57Cu15.4Ni12.6Nb5Al10 glass.
  • To investigate the temperature dependence of vacancy kinetics.
  • To correlate vacancy behavior with macroscopic properties like viscosity.

Main Methods:

  • High-resolution, time-differential dilatometry was employed.
  • Dilatometry precisely measured volume changes associated with defect formation/annihilation.
  • Kinetic analysis was performed to determine migration enthalpy.

Main Results:

  • Direct evidence for reversible vacancy-type defects was obtained.
  • Vacancy kinetics were found to be strongly temperature-dependent.
  • An effective migration enthalpy (HVM) of 3.34 eV was determined.

Conclusions:

  • The observed vacancy dynamics can explain the temperature dependence of glass properties, such as viscosity.
  • These findings have broad implications for amorphous condensed matter and biomaterials.
  • The study contributes to the technical development of amorphous steels.