Thermal decompositions of ammonium and potassium alums |
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Authors: | R Wojciechowska W Wojciechowski J Kamiński |
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Institution: | (1) Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Polytechnical University of Wroc aw, 50-370 Wroc aw, Poland |
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Abstract: | 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 energiesE
a were calculated for all steps of the thermal decomposition reactions.
Zusammenfassung 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.
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