• Thermal decomposition of natural dolomite

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    • Keywords

       

      TGA–DTA; FTIR; X-ray diffraction; dolomite.

    • Abstract

       

      Thermal decomposition behaviour of dolomite sample has been studied by thermogravimetric (TG) measurements. Differential thermal analysis (DTA) curve of dolomite shows two peaks at 777.8°C and 834°C. The two endothermic peaks observed in dolomite are essentially due to decarbonation of dolomite and calcite, respectively. The TG data of the decomposition steps have also been analysed using various differential, difference-differential and integral methods, viz. Freeman–Carroll, Horowitz–Metzger, Coats–Redfern methods. Values of activation entropy, Arrhenius factor, and order of reaction have been approximated and compared. Measured activation energies vary between 97 and 147 kJ mol-1. The large fluctuation in activation energy is attributed to the presence of impurities such as SiO2, Al2O3, Fe2O3, Cl- etc in the samples. FTIR and XRD analyses confirm the decomposition reaction. SEM observation of the heat-treated samples at 950°C shows cluster of grains, indicating the structural transformation.

    • Author Affiliations

       

      S Gunasekaran1 G Anbalagan2

      1. PG and Research Department of Physics, Pachaiyappa’s College, Chennai 600 030, India
      2. PG and Research Department of Physics, Presidency College, Chennai 600 005, India
    • Dates

       
  • Bulletin of Materials Science | News

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