Journal of thermal analysis

, Volume 33, Issue 2, pp 503–509 | Cite as

Thermal decompositions of ammonium and potassium alums

  • R. Wojciechowska
  • W. Wojciechowski
  • J. Kamiński
Solid State Reactions


Simultaneous TG, DTG and DTA studies of NH4Al(SO4)2.12H2O and KAl(SO4)2.12H2O under nonisothermal conditions were performed with a derivatograph, over the temperature range from 293 K to 1473 K under air and argon atmospheres. Appropriate chemical reactions were attributed to the thermal effects, with consideration to the results of X-ray diffraction and microscopic analyses. From the recorded curves, the activation energiesEa were calculated for all steps of the thermal decomposition reactions.


Polymer Atmosphere Ammonium Potassium Argon 
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Simultane TG-DTG-DTA-Untersuchungen von NH4Al(SO4)2.12H2O und K.Al(SO4)2.12H2O wurden unter nicht-isothermen Bedingungen mit einem Derivatographen von 293–1473 K an Luft und unter Argon durchgeführt. Den thermischen Effekten werden chemische Reaktionen zugordnet, wobei Röntgenbeugungs- und mikroskopische Ergebnisse berücksichtigt werden. Aus den thermoanalytischen Messkurven werden Aktivierungsenergien der Zersetzungsreaktionen berechnet.


С помощью дериватогр афа проведены совмещенные ТГ, ДТГ и Д ТА исследования NH4Al(SO4)2.12Н2О и KAl(SO4)2.12Н2О в неизо термических условиях в атмосфере воздуха и аргона в интервале те мператур 293–1473 К. На основ е рентгенофазового и м икроскопического анализа, происходящи е химические реакции были отнесены к соответст вующим термическим эффектам. На основани и измеренных кривых б ыли вычислены энергии ак тивации Еa для всех стадий термического разложения.


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Copyright information

© Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest 1988

Authors and Affiliations

  • R. Wojciechowska
    • 1
  • W. Wojciechowski
    • 1
  • J. Kamiński
    • 1
  1. 1.Institute of Inorganic Chemistry and Metallurgy of Rare ElementsPolytechnical University of WrocławWrocł awPoland

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