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Borate Glasses pp 463-476 | Cite as

Viscoelastic Relaxation in B2O3

  • P. B. Macedo
  • C. J. Montrose
  • C. T. Moynihan
  • C. C. Lai
Part of the Materials Science Research book series (MSR, volume 12)

Abstract

The relative ease with which its viscosity can be measured over a wide range of temperature (260–1600°C) has made B2O3 one of the materials most often used to test viscosity theories. It exhibits two Arrhenius regions: a high temperature region between 800–1400°C and a low temperature one, 260–350°C. In a previous publication1 we have shown that none of the theoretical models for viscosity thus far proposed account for this behavior; not only are they inadequate in an exact quantitative sense, but they also fail to explain the general trends. This inadequacy is quite a general one, having been noted in many types of liquids including silicates, molten salts, aqueous solutions and organic liquids. Recognizing the difficulties that other investigators had encountered, our approach to trying to understand viscous flow was to ask a set of fundamental questions followed by an intensive experimental investigation. In this way we hoped that the data would naturally guide the theoretical development.

Keywords

Correlation Function Structural Relaxation Viscoelastic Relaxation Activation Free Energy Fictive Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • P. B. Macedo
    • 1
  • C. J. Montrose
    • 1
  • C. T. Moynihan
    • 1
  • C. C. Lai
    • 1
  1. 1.Vitreous State LaboratoryCatholic University of AmericaUSA

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