Chemical ordering and fragility minimum in Cu-As-Se glasses

Ramesha, K. ; Asokan, S. ; Gopal, E. S. R. (2006) Chemical ordering and fragility minimum in Cu-As-Se glasses Journal of Non-Crystalline Solids, 352 (26-27). pp. 2905-2912. ISSN 0022-3093

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.jnoncrysol.2006.03.076

Abstract

Modulated Differential Scanning Calorimetric (MDSC) studies have been performed on CuxAs40Se60-x glasses with x ranging between 0 and 30 at.%. The thermal parameters, namely the glass transition temperature (Tg), the heat capacity (Cρ) and the jump in heat capacity at the glass transition (Δ Cρ) are measured. The composition dependence of these thermal parameters has been found to exhibit interesting variations particularly at x = 20. Thermal crystallization studies show that the structural network is mainly characterized by the ternary Cu3AsSe4 units with As2Se3 and Cu2As3 units depending on the concentration of Cu. These structural differences arising as a function of composition are reflected in the Tg, Cρ and ΔCρ. The observed transitions are also understood on the basis of Formal Valence Shell (FVS) model and the classification of strong and fragile liquids.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Amorphous Semiconductors; Crystallization; Chalcogenides; Short-range Order; Thermal Properties; Glass Transition; Fragility; X-ray Diffraction
ID Code:71101
Deposited On:24 Nov 2011 04:04
Last Modified:24 Nov 2011 04:04

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