Evaluation of specific heat and related thermodynamic properties of Ge1−x Sn x Se2.5 (0 ≤ x ≤ 0.5) glasses
- 35 Downloads
This paper presents the result of thermodynamic studies on Ge1−x Sn x Se2.5 (0 ≤ x ≤ 0.5) glasses using differential scanning calorimetry. The obtained experimental results on phase transformations have been employed to obtain thermodynamic parameters like entropy difference between metastable states in the glassy region, difference of Gibbs free energy, specific heat, entropy between the glassy and the crystalline phase and the enthalpy released during phase transformation (glassy to crystalline). The results yield that, Ge0.7Sn0.3Se2.5 sample is least stable among all the samples. The stability increases on addition of Sn beyond 0.3 at. mass% upto 0.5 at. mass%.
KeywordsEnthalpy Entropy Gibbs free energy Specific heat Stability
One of the author ‘Deepika’ is thankful to DSA programme of University Grant Commission in the department of physics for providing financial assistance during this work. Authors are also thankful to Ms. Manasvi Dixit for her help in various ways.
- 8.Lele S, Dubey KS, Ramchandrarao P. On the temperature dependence of free energy of crystallization. Curr Sci. 1985;54:994–5.Google Scholar
- 11.Tiwari RS, Mehta N, Shukla RK, Kumar A. J. Ovon. Res., 2 (4) (2006) 53-9.Google Scholar
- 15.Borisova ZU. Glassy semiconductors. New York: Plenum; 1981.Google Scholar
- 18.Azroff LV. Introduction to solids. New York: McGraw Hill; 1988.Google Scholar