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http://dx.doi.org/10.9729/AM.2017.47.3.110

Evaluation of Kinetic Parameters and Thermal Stability of Melt-Quenched BixSe100-x Alloys (x≤7.5 at%) by Non-Isothermal Thermogravimetric Analysis  

Ahmad, Mais Jamil A. (Leibniz Institut fur Analytische Wissenschaften-ISAS e.V.)
Abdul-Gader Jafar, Mousa M. (Department of Physics, Faculty of Science, The University of Jordan)
Saleh, Mahmoud H. (Department of Physics and Basic Sciences, Faculty of Engineering Technology, Al-Balqa Applied University)
Shehadeh, Khawla M. (Department of Physics, Faculty of Science, The University of Jordan)
Telfah, Ahmad (Leibniz Institut fur Analytische Wissenschaften-ISAS e.V.)
Ziq, Khalil A. (Physics Department, King Fahd University of Petroleum and Minerals)
Hergenroder, Roland (Leibniz Institut fur Analytische Wissenschaften-ISAS e.V.)
Publication Information
Applied Microscopy / v.47, no.3, 2017 , pp. 110-120 More about this Journal
Abstract
Non-isothermal thermogravimetry (TG) measurements on melt-quenched $Bi_xSe_{100-x}$ specimens (x=0, 2.5, 7.5 at%) were made at a heating rate ${\beta}=10^{\circ}C/min$ in the range $T=35^{\circ}C{\sim}950^{\circ}C$. The as-measured TG curves confirm that $Bi_xSe_{100-x}$ samples were thermally stable with minor loss at $T{\leq}400^{\circ}C$ and mass loss starts to decrease up to $600^{\circ}C$, beyond which trivial mass loss was observed. These TG curves were used to estimate molar (Se/Bi)-ratios of $Bi_xSe_{100-x}$ samples, which were not in accordance with initial composition. Shaping features of conversion curves ${\alpha}(T)-T$ of $Bi_xSe_{100-x}$ samples combined with a reliable flow chart were used to reduce kinetic mechanisms that would have caused their thermal mass loss to few nth-order reaction models of the form $f[{\alpha}(T)]{\propto}[1-{\alpha}(T)]^n$ (n=1/2, 2/3, and 1). The constructed ${\alpha}(T)-T$ and $(d{\alpha}(T)/dT)-T$ curves were analyzed using Coats-Redfern (CR) and Achar-Brindley-Sharp (ABS) kinetic formulas on basis of these model functions, but the linearity of attained plots were good in a limited ${\alpha}(T)-region$. The applicability of CR and ABS methods, with model function of kinetic reaction mechanism R0 (n=0), was notable as they gave best linear fits over much broader ${\alpha}(T)-range$.
Keywords
Non-isothermal kinetics; Thermogravimetric analysis; Coats-Redfern kinetic model; Achar-Brindley-Sharp kinetic model; Bismuth-selenium alloys;
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