ACTA

Magnetization as an Effective Tool for Kinetics Evaluation in Mechanochemical Synthesis of Chalcopyrite CuFeS₂

P. Baláž^a, M. Baláž^a, E. Dutková^a, M. Hegedus^b, M. Rajňák^{c, d}, K. Knížek^e, J. Hejtmánek^e, J. Navrátil^f, M. Achimovičová^a, J. Briančin^a
^aInstitute of Geotechnics, SAS, Watsonova 45, 040 01 Košice, Slovakia
^bVarmind s.r.o., Nové Sady 988/2, 602 00 Brno, Czech Republic
^cInstitute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia
^dFaculty of Electrical Engineering and Informatics, Technical University of Košice, Letná 9, 04200 Košice, Slovakia
^eInstitute of Physics of the Czech Academy of Sciences, Cukrovarnická 10/112, 162 00, Praha 6, Czech Republic
^fUniversity of Pardubice, Faculty of Chemical Technology, Studentská 573, 532 10 Pardubice, Czech Republic

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Copper, iron, and sulphur in elemental form were applied for mechanochemical synthesis of chalcopyrite CuFeS₂. Products of synthesis were characterized by XRD method and evaluated by Rietveld analysis. A mixture of cubic (JCPDS 75-6866) and tetragonal (JCPDS 37-0471) phases of chalcopyrite with almost identical diffractograms were identified. Both phases are nanocrystalline with sizes 13 nm and 7 nm for laboratory and industrial milling, respectively. For determination of iron consumption during the synthesis, method of magnetometry has been applied. Based on magnetization data reflecting time dependent incorporation of elemental iron into chalcopyrite nanostructure, the kinetics of the synthesis was evaluated. From kinetic data the rate constant of reaction k, as well as the conversion degree R were determined. High conversion degree of mechanochemical synthesis performed in a laboratory mill (R=100%), as well as in an industrial mill (R=96%) offer the possibility to scale-up the process of synthesis in preparation of this perspective magnetic semiconductor. The method of magnetometry was proved to be an effective tool for following the processes of synthesis where iron particles are incorporated.

DOI:10.12693/APhysPolA.137.647
PACS numbers: 81.05.Bx, 81.07.Wx, 81.20.Wk