Nonisothermal decomposition kinetics of pure and Mn-doped Fe3O4 nanoparticles
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Pure Fe3O4 and Mn-doped Fe3O4 nanoparticles were synthesized by simple wet chemical reduction technique using nontoxic precursors. Manganese doping of two concentrations, 10 and 15%, were employed. All the three synthesized nanoparticles were characterized by stoichiometry, crystal structure, and surface morphology. Thermal studies on as-synthesized nanoparticles of pure ferrite (Fe3O4) and manganese (Mn) doped ferrites were carried out. The thermal analysis of the three as-synthesized nanoparticles was done by thermogravimetric (TG), differential thermogravimetric, and differential thermal analysis techniques. All the thermal analyses were done in nitrogen atmosphere in the temperature range of 308–1233 K. All the thermocurves were recorded for three heating rates of 10, 15, and 20 K min−1. The TG curves showed three steps thermal decomposition for Fe3O4 and two steps thermal decompositions for Mn-doped Fe3O4 nanoparticles. The kinetic parameters of the three as-synthesized nanoparticles were evaluated from the thermocurves employing Kissinger–Akahira–Sunose (KAS) method. The thermocurves and evaluated kinetic parameters are discussed in this paper.
KeywordsFerrite Thermogravimetric Differential thermogravimetric Differential thermal analysis Kinetic parameters
All the authors are thankful to the Sophisticated Instrumentation Centre for Applied Research & Testing (SICART), Vallabh Vidyanagar, Gujarat, India, for XRD analysis. The authors are grateful to the Department of Metallurgical Engineering, Faculty of Engineering and Technology, M S University of Baroda, Vadodara, India, for EDAX of our samples. The authors are grateful to the Central Salt and Marine Chemical Research Institute, Bhavnagar, Gujarat, India, for SEM analysis. One of the authors, Tasmira J. Malek, is thankful to University Grants Commission (UGC), New Delhi, for the award of Maulana Azad National Fellowship (MANF) to carry out this research work.
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