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Publikācija: Fabrication and Characterization of Magnetic FePt Nanoparticles Prepared by Extraction-Pyrolysis Method

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity State funding for education
Defending: ,
Publication language English (en)
Title in original language Fabrication and Characterization of Magnetic FePt Nanoparticles Prepared by Extraction-Pyrolysis Method
Field of research 1. Natural sciences
Sub-field of research 1.4 Chemical sciences
Authors Vera Serga
Mikhail Maiorov
Antons Cvetkovs
Aija Krūmiņa
A.I. Popov
Keywords FePt alloy, extraction-pyrolysis method, Fe/Pt composition, high magnetic coercivity
Abstract In the present work, possibilities of the extraction-pyrolysis method (EPM) to produce FePt nanoparticles with the face-centered tetragonal (fct) phase were studied. A mixture of fine-disperse powder of carbonyl iron and n-trioctylammonium hexachloroplatinate [(С8Н17)3NH]2PtCl6 solution in toluene, preliminary produced by the solvent extraction method, is used as a precursor. Precursors with different molar ratio of metals were used. The performed investigations show that as a result of pyrolysis in the air (Tpyr = 600 0C, tanneal = 30 min), a FePt alloy with the fct phase is produced. Moreover, such phases as FePt3 and/or Fe3Pt with the cubic structure may be also present in the final products. The phase composition of the produced samples depends on the Fe:Pt molar ratio in the precursor. An increase of the fct phase part with the growth of the iron content from 40 mol% to 60 mol% is observed. Also, with the Fe80%Pt20% molar ratio of the metals in the precursor, only the ordered fct phase along with a small amount of hematite and iron chloride exists in the produced sample. Magnetic measurements confirm the fct-FePt phase formation in all produced samples and evidence that the coercivity exceeds the value (3 kOe) at the 50 mol% Fe concentration in the precursor and significantly decreases with the increasing Fe concentration to 80 mol%.
Reference Serga, V., Maiorov, M., Cvetkovs, A., Krūmiņa, A., Popov, A. Fabrication and Characterization of Magnetic FePt Nanoparticles Prepared by Extraction-Pyrolysis Method. Chemija, 2018, Vol.29, No.2, pp.107-111. ISSN 0235-7216. e-ISSN 2424-4538.
ID 27445