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Fragility percentage evaluation for glass forming melts

D. RADU1,* , M. S. NICOLESCU2, N. PROTOPOPESCU2

Affiliation

  1. University “Politehnica” of Bucharest, Department” Science and Engineering of Oxide Materials and Nanomaterials”, P.O. Box 12-134, Bucharest, Romania
  2. National Glass Institute, Theodor Pallady 47 Blvd., Bucharest, 74584, Romania

Abstract

The dependence of the viscosity on temperature for glass forming melts separates them into two categories: fragile and strong. We propose an intuitive method for quantitative evaluation of the glass forming melts fragility by a structural parameter – fragility percentage pF which allows the comparison of the glass melts without considering their particular chemical composition. A strong correlation between fragility percentage and the main number of non-bridged oxygen (Onb) was established. The study is also related to a numerical application of the proposed indicator made for glass with different chemical compositions compared with the base oxide system Na2O-SiO2. The greater the basicity of the glasses the more fragile character of the glass forming melts is observed..

Keywords

Melts fragility, Basicity, Dipolar bonds.

Submitted at: April 12, 2007
Accepted at: Dec. 7, 2007

Citation

D. RADU, M. S. NICOLESCU, N. PROTOPOPESCU, Fragility percentage evaluation for glass forming melts, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 12, pp. 3765-3768 (2007)