Non-isothermal crystallization kinetics of non-crystalline Ge10Se90−xTlx ternary glass alloys
Ismail, A.M.; E. G. El-Metwally; Assim, Eman;
Abstract
The crystallization kinetics of Ge10Se(90−x)Tlx (x=20, 30 and 40 at. %) chalcogenide glasses have been intensively
studied using non-isothermal differential thermal analysis DTA. Various models were applied to determine
the average values of activation energies for the glass transition Eg and crystallization Ec processes as a
function of the glass transition temperature Tg, onset crystallization temperature Tc and peak crystallization
temperature Tp with heating rate α and Tl content. The values of Eg and Ec were found to be dependent on both of
the heating rate and system composition. In Accordance with Avrami exponent n, the crystallization mechanism
in the compositions Ge10Se70Tl20 and Ge10Se60Tl30 is three dimensional growth, while in Ge10Se50Tl40 is two
dimensional nucleation growth. Thermal characteristics of the investigated ternary glass alloy such as fragility
Fg, stability SP and glass formation ability GFA were also studied.
studied using non-isothermal differential thermal analysis DTA. Various models were applied to determine
the average values of activation energies for the glass transition Eg and crystallization Ec processes as a
function of the glass transition temperature Tg, onset crystallization temperature Tc and peak crystallization
temperature Tp with heating rate α and Tl content. The values of Eg and Ec were found to be dependent on both of
the heating rate and system composition. In Accordance with Avrami exponent n, the crystallization mechanism
in the compositions Ge10Se70Tl20 and Ge10Se60Tl30 is three dimensional growth, while in Ge10Se50Tl40 is two
dimensional nucleation growth. Thermal characteristics of the investigated ternary glass alloy such as fragility
Fg, stability SP and glass formation ability GFA were also studied.
Other data
| Title | Non-isothermal crystallization kinetics of non-crystalline Ge10Se90−xTlx ternary glass alloys | Authors | Ismail, A.M. ; E. G. El-Metwally ; Assim, Eman | Keywords | Chalcogenide glasses Crystallization kinetics Thermal stability Fragility. | Issue Date | 2018 | Publisher | Elsevier | Journal | Journal of Non-Crystalline Solids | Volume | 496 | Start page | 48 | End page | 55 | ISSN | 00223093 | DOI | 10.1016/j.jnoncrysol.2018.05.033 |
Attached Files
| File | Description | Size | Format | Existing users please Login |
|---|---|---|---|---|
| Non-isothermal crystallization kinetics of non-crystalline Ge10Se90−xTlx ternary glass alloys.pdf | 1.48 MB | Unknown | Request a copy |
Similar Items from Core Recommender Database
Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.