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Average Coordination-Number Dependence Of Glass-Transition Temperature In Ge Se Chalcogenide Glasses

Sun, 2015-05-10 10:21 — Ghassan Saffarini

Journal Title, Volume, Page:

Applied Physics A July 1995, Volume 61, Issue 1, pp 29-32

Year of Publication:

1995

Link:

http://link.springer.com/article/10.1007/BF01538206

Authors:

G. Salfarini

Department of Physics, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Physics, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

A. Schlieper

Anorganische Chemie, Universität Osnabrück, D-49069, Osnabrück, Germany

Preferred Abstract (Original):

Twenty-six glassy compositions, belonging to the GexIn6Se94-x and GexIn12Se88-x families of the Ge-In-Se system, were prepared from high purity constiment elements. Differential Scanning Calorimetry (DSC) measurements were carried out on these glasses. The DSC thermograms were used to determine the glass transition temperatures (T g) for the compositions examined. TheT g-composition dependence of the GexIn6Se94-x family shows a minimum inT g at a value of the average coordination number, 〈r⦔, equal to 2.4. For both families of the glasses examined, theT g-〈r〉 dependence displays maxima at 〈r〉=2.75 and 〈r〉=2.83 for GexIn6Se94-x and GexIn12Se88-x families, respectively. These results are interpreted by using the Phillips model of rigidity percolation and Chemically Ordered Covalent Network (COCN) model.

The Effect of Compositional Variations on The Glass-Transition And Crystallisation Temperatures Inge−Se−In Glasses

Mon, 2011-03-07 12:31 — Ghassan Saffarini

Journal Title, Volume, Page:

Materials Science & Processing, Volume 74, Number 2 / February, 2002

Year of Publication:

2002

Link:

http://www.springerlink.com/content/2erebvtpdjkr4raj/

Authors:

G. Saffarini

Department of Physics, Faculty of Sciences, An-Najah National University, Palestine

Current Affiliation:

Department of Physics, Faculty of Sciences, An-Najah National University, Palestine

[email protected]

Preferred Abstract (Original):

The glass-transition (T_g) and crystallisation (T_x) temperatures of glassy Ge_xSe_yIn₁₂ (7≤x≤28) have been determined from differential scanning calorimetry measurements. The variations of T_g and T_x with composition have been specified. It has been found that T_g reaches a maximum at 614 K for the composition Ge_23.33 Se_64.67 In₁₂ while T_x passes through a minimum at 740 K for the same composition. The values of the cohesive energies of the studied compositions have also been estimated using the chemical bond approach method. It is found that the composition Ge_23.33Se_64.67In₁₂ possesses the maximum cohesive energy. These results are explained in terms of the structure of Ge-Se-In glasses.