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Glass homogeneity precursive to self-organization

P. BOOLCHAND1,* , S. BHOSLE1, K. GUNASEKERA1, K. VIGNAROOBAN1, S. CHAKRABORTY1

Affiliation

  1. School of Electronics and Computing System, College of Engineering and Applied Science, University of Cincinnati, Cincinnati, OH 45221-0030 USA

Abstract

Raman profiling of chalcogenide melts provides a powerful method to track the structural homogenization of batches in real time. Recent results on 2 gram sized GexSe100-x melts reacted at 950°C in high vacuum show such melts to homogenize in 168 hours on a scale of 10μm. In such dry and homogeneous glasses, sharply defined rigidity and stress transitions are observed, leading to a square-well like reversibility window. The window is signature of the self-organized Intermediate Phase (IP) with remarkable properties. In oxide glasses, reversibility windows are also observed, and are sharply defined even though melts were reacted for less than 6 hours.Modified oxides apparently homogenize quicker than those of chalcogenides. The variations in the non-reversing enthalpy at Tg , stretched exponents β, and molar volumes, each studied as a function of glass composition appear to be strongly influenced by sample heterogeneity and purity. Glass homogeneity appears to be precursive to network self-organization..

Keywords

Self-organization, Raman profiling, modulated DSC, Stretched exponent, Intermediate Phase, Glass homogeneity and dryness.

Submitted at: Nov. 1, 2011
Accepted at: Nov. 23, 2011

Citation

P. BOOLCHAND, S. BHOSLE, K. GUNASEKERA, K. VIGNAROOBAN, S. CHAKRABORTY, Glass homogeneity precursive to self-organization, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 11-12, pp. 1353-1358 (2011)