NJGC  Vol.3 No.4 , October 2013
Kinetics of Phase Transformations and Thermal Stability of GexSe70Sb30-x (x = 5, 10, 15, 20) Chalcogenide Glasses
Abstract: Kinetic studies of two-phase transformations i.e. glass transition and crystallization for GexSe70Sb30-x (x = 5, 10, 15, 20) glasses have been performed using differential scanning calorimetry (DSC) at different heating rates under non-isothermal condition. The glass transition and crystallization regions have been investigated in terms of their characteristic temperatures i.e. glass transition temperature Tg and crystallization temperature Tc and activation energy. The activation energies of glass transition and crystallization have been calculated by employing peak shift method of Kissinger and isoconversional methods. Activation energies have been found to be dependent on the composition. The thermal stabili- ty is determined from the temperature difference ΔT = Tc — Tg where Tc and Tg are the onset crystallization and glass transition temperature respectively. It has been found that Ge15Se70Sb15 glass is thermally more stable as compared to the other members of the series.
Cite this paper: A. Kaswan, V. Kumari, D. Patidar, N. S. Saxena and K. Sharma, "Kinetics of Phase Transformations and Thermal Stability of GexSe70Sb30-x (x = 5, 10, 15, 20) Chalcogenide Glasses," New Journal of Glass and Ceramics, Vol. 3 No. 4, 2013, pp. 99-103. doi: 10.4236/njgc.2013.34016.

[1]   K. Tanaka, “Structural Phase Transition in Chalcogenide Glasses,” Physical Review B, Vol. 39, No. 2, 1989, pp. 1270-1279.

[2]   S. Kumar, M. Hussain and M. Zulfequar, “Effect of Silver on the Dielectric Properties,” Physica B, Vol. 371, No. 2, 2006, pp. 193-198.

[3]   M. Esquerre, J. C. Carballes, J. P. Audiere and C. Ma- zieres, “Crystallization of Amorphos (Bulk and Thin Films) GexSe1-x (0 < x < 0.20) Alloys,” Journal of Materials Science, Vol. 13, No. 6, 1978, pp. 1217-1223.

[4]   A. B. Ghokle and R. B. Abbaschaian, “The Ge-Se (Germenium-Selinum) System,” Bulletin of Alloy Phase Diagrams, Vol. 11, No. 3, 1990, pp. 257-263.

[5]   A. R. Hillton and D. J. Hayes, “The Interdependence of Physical Parameters for Infrared Transmiting Glasses,” Journal of Non-Crystalline Solids, Vol. 17, No. 3, 1975, pp. 339-348.

[6]   M. Frumer, H. Ticha, J. Klikoka and P. Tomiska, “Optical Absorption in Vitreous GeSb2Se4,” Journal of Non- Crystalline Solids, Vol. 13, No. 1, 1973, pp. 173-178.

[7]   J. A. Savage, P. J. Webber and A. M. Pitt, “An Assessment of Ge-Sb-Se Glasses as 8 to 12 μm Infrared Optical Materials,” Journal of Materials Science, Vol. 13, No. 4, 1987, pp. 859-864.

[8]   M. Lasocka, “The Effect of Scanning Rate on Glass Transition Temperature of Splat-Cooled Te85Ge15,” Materials Science and Engineering, Vol. 23, No. 2-3, 1976, pp. 173- 176.

[9]   M. M. A. Imran, D. Bhandri and N. S. Saxena, “Enthalpy Recovery during Structural Relaxations of Se96In4 Chalcogenide Glasses,” Physica B, Vol. 293, No. 3-4, 2001, pp. 394-401.

[10]   H. E. Kissinger, “Reaction Kinetics in the Differential Thermal Analysis,” Analytical Chemistry, Vol. 29, No. 11, 1957, pp. 1702-1706.

[11]   H. S. Chen, “A Method for Evaluating Viscosities of Metallic Glasses from the Rates of Thermal Transformations,” Journal of Non-Crystalline Solids, Vol. 27, No. 2, 1978, pp. 257-263.

[12]   J. E. Shelby, “Thermal Expansion of Amorphous Metals,” Journal of Non-Crystalline Solids, Vol. 34, No. 1, 1979, pp. 111-119.

[13]   H. E. Kissinger, “Variation of Peak Temperature with Heating Rate in Differential Thermal Analysis,” Journal of Research of the National Bureau of Standards, Vol. 57, No. 4, 1956, pp. 217-221.

[14]   T. Akahira and T. Sunose, “Joint Convention of Four Electrical Institutes,” Science Technology, Vol. 16, 1971, pp. 22-31.

[15]   T. Ozawa, “A New Method of Analyzing Thermogravimetric Data,” Bulletin of The Chemical Society of Japan, Vol. 38, No. 11, 1965, pp. 1881-1886.

[16]   J. Flynn and A. Wall, “A Quick, Direct Method for the Determination of Activation Energy from Thermogravimetric Data,” Journal of Polymer Science Part B, Vol. 4, No. 5, 1966, pp. 323-328.

[17]   H. L. Friedman, “Kinetics of Thermal Degradation of Charforming Plastics from Hermogravimetry and Application to a Phenolic Plastic,” Journal of Polymer Science Part C, Vol. 6, No. 1, 1964, pp. 183-185.

[18]   S. Mahadevan, A. Giridhar and A. K. Singh, “Calorimetric Measurements on As-Sb-Se Glasses,” Journal of Non-Crystalline Solids, Vol. 88, No. 1, 1986, pp. 11-34.