First Order Phase Transformation in Amorphous Ge25Se75 – xSbx Glasses

Authors F.A. Al-Agel1, F.M. Al-Marzouki1, A.A. Al-Ghamdi1, Shamshad A. Khan2, M. Husain3

1 Department of Physics, King Abdulaziz University, Jeddah-21589, Saudi Arabia

2 Department of Physics, St. Andrew’s College, Gorakhpur, UP 273001, India

3 Department of Physics, Jamia Millia Islamia, New Delhi-110025, India

Issue Volume 5, Year 2013, Number 2
Dates Received 15 February 2013; revised manuscript received 06 May 2013; published online 07 May 2013
Citation F.A. Al-Agel, F.M. Al-Marzouki, A.A. Al-Ghamdi, et al., J. Nano- Electron. Phys. 5 No 2, 02021 (2013)
PACS Number(s) 71.55.Jv, 65.90. + I, 67.80.Gb, 73.61.Jc
Keywords Glass transition temperature (3) , Crystallization kinetics, X-Ray diffraction (19) , Phase transformation.
Annotation Non-isothermal Differential scanning calorimetry (DSC) technique was used to study the kinetics of first order phase transformation in Ge25Se75 – xSbx glasses. The X-ray diffraction (XRD) technique was employed to investigate the amorphous and crystalline phases in Ge25Se75 – xSbx glasses. From the heating rate dependences of crystallization temperature; the activation energy for crystallization and other kinetics parameters were derived. The temperature difference (Tc – Tg) and Tc is highest for the samples with 6 % of Sb. Hence, Ge25Se69Sb6 glass is most stable. The enthalpy released is found to be less for Ge25Se69Sb6 glass which further confirms its maximum stability. The activation energy of crystallization (Ec) is found to vary with compositions indicating a structural change due to the addition of Sb. The crystallization data are interpreted in terms of recent analyses developed for non-isothermal conditions. The present investigation indicates that both the glass transition and the crystallization processes occur in a single stage.

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