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Mass spectrometry based evolved gas analysis system for thermal decomposition studies

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Abstract

An experimental facility for evolved gas analysis by mass spectrometry (EGA-MS) has been built in-house and extensively used to study the temperature programmed decomposition (TPD) of a number of inorganic solids. Fractional extent of reactionα acquired from real time multiple ion detection trend analysis mass spectra of gases released from thermally impressed specimen has been used to obtain functional transformf(α) of non-isothermal solid state kinetic rate expressions. The corresponding model integral functionsg(α) based on mechanisms like random nucleation, diffusion and interface motion have been used to establish kinetics control regimes for specific decomposition sequences. From ln[g(α)/T 2] vs 1/T plots Arrhenius parameters like activation energy and pre-exponential factor could be determined. Signature of the rate controlling mechanism governing the gas release behaviour was found in the crystallographic transformation brought about by the temperature programme. This paper describes the scope and capabilities of our EGA-MS facility with typical results on temperature programmed decomposition of CuSO4·5H2O and AlNH4(SO4)2·12H2O.

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Authors and Affiliations

  1. Materials Science Division, Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India

    S Dash, M Kamruddin & A K Tyagi

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  1. S Dash
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  2. M Kamruddin
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  3. A K Tyagi
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Dash, S., Kamruddin, M. & Tyagi, A.K. Mass spectrometry based evolved gas analysis system for thermal decomposition studies. Bull Mater Sci 20, 359–375 (1997). https://doi.org/10.1007/BF02745102

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