Browsing by Author "Alaa Dahshan"

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Kinematics of glass to crystal phase transformation in novel multi-component glassy Se-Te-Sn-M (M = Sb, In, Cd) alloys; [Cinemática de la transformación de fase de vidrio a cristal en nuevas aleaciones vítreas multicomponente Se-Te-Sn-M (M = Sb, In, Cd)]
(Sociedad Espanola de Ceramica y Vidrio, 2022) Namrata Chandel; Neeraj Mehta; Alaa Dahshan
The kinetics of the thermally induced glass / crystal phase transformation of chalcogenide glasses plays an important role in determining their candidacy for optical phase change memory applications. The rate of crystallization and the corresponding activation energy are the two crucial kinetic parameters that reflect the durability and quality (i.e., storage properties) of phase change materials. This script deals with metal-induced effects on thermally regulated non-isothermal crystallization in a new glass alloy of Se-Te-Sn using calorimetric measurements. The elements Antimony (Sb), Cadmium (Cd) and Indium (In) have been used as structural modifiers for this purpose. The crystallization and glass transition kinetics of these glass alloys have been investigated by thermal analysis of several kinetic parameters such as the parameter of order n, the maximum crystallization temperature Tc, the crystallization rate K and the consequent activation energy Ec). A DSC is used in non-isothermal mode for the present studies. The values of the activation energy Ec are determined using the data obtained from the displacement of the exothermic peaks of crystallization in non-isothermal DSC plots at various heating rates. The role of the additives Sb, Cd and In in the variation in the rate of crystallization K of and the Avrami index (n) for each glass alloy is also examined. Detailed thermal analysis of the kinetic data confirms the superiority of Cd over the other two additives (In and Sb) for optimization of the kinetic properties of the main SeTeSn glass. © 2021 SECV.
Role of some modifiers on the thermo-mechanical properties of Se90In10chalcogenide glass (ChGs)
(EDP Sciences, 2021) Alaa Dahshan; Horesh Kumar; Neeraj Mehta
The studies on the micro-hardness of ChGs provide useful information regarding their straightforward involvement in the fabrication of sensors, fibers, and other optical elements for direct use in infrared optics. This work deals with the mechanical response of the glassy Se90In10alloy under the influence of additives (Sn, Ag, Sb, and Ge). For this, we have determined the micro-hardness of all glassy alloys. Using the values of Vickers hardness (Hv), glass transition temperature (Tg), and present glasses, we have calculated the other significant thermo-mechanical parameters. The effect of Sn, Ag, Sb, and Ge additives on the micro-hardness of glassy Se90In10alloy is also discussed. © 2021 EDP Sciences. © 2021 EDP Sciences. All rights reserved.