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)).