Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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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.)
  • Received : 2017.06.07
  • Accepted : 2017.09.01
  • Published : 2017.09.30
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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

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