Theoretical Study of Role of Sb in Se0.85-xTe0.15Sbx Chalcogenide Glass in Influencing Glass Transition Temperature

N. B. Maharjan (Tribhuvan University, Kirtipur, Kathmandu, Nepal), D. D. Paudyal (TU, Kirtipur), J. Jeong (SUNY Albany, Albany, NY), R. H. Scheicher, T. P. Das (SUNY, Albany)

The influence of Sb impurity on glass transition temperature (Tg) has recently been studied using Differential Scanning Calorimetry (N. B. Maharjan et al., Phy. Stat. Sol. (a) 178, 663 (2000)). The results indicate that Tg initially increases with Sb concentration (x), reaching a maximum at 0.04, subsequently decreasing till x=0.06 and then becoming constant. Qualitative explanation of this behavior for Tg has been suggested using earlier ideas in the literature regarding the role of Sb in the
interaction between chains in the Se1-xTex system and bond energy strength considerations involving Se-Se and Sb-Se bonds. These ideas are being tested quantitatively using Hartree-Fock Cluster procedures, previously utilized by our group for study (H. S. Cho et al., (to be published); H. S. Cho et al., Hyperfine Interactions 96, 213 (1995)) of nuclear quadrupole interactions including that of 125Te in Selenium and Tellurium (P. Boolchand et al., Phys. Rev. Lett. 30, 1292 (1973)).

(back to Abstracts page)