High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H<sub>2</sub> Reduction of Co-Ferrites
Cobalt ferrite nanoparticles of different stoichiometries synthesized by a sol–gel autocombustion method were used as a starting material to obtain high-moment Fe<sub>50</sub>Co<sub>50</sub> and Fe<sub>66</sub>Co<sub>34</sub> metal nanoparticles by top...
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MDPI AG
2022-02-01
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| Online Access: | https://www.mdpi.com/2076-3417/12/4/1899 |
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| author | Alexander Omelyanchik Gaspare Varvaro Pierfrancesco Maltoni Valeria Rodionova Jean-Pierre Miranda Murillo Federico Locardi Maurizio Ferretti Claudio Sangregorio Fabio Canepa Petr Chernavsky Nikolai Perov Davide Peddis |
| author_facet | Alexander Omelyanchik Gaspare Varvaro Pierfrancesco Maltoni Valeria Rodionova Jean-Pierre Miranda Murillo Federico Locardi Maurizio Ferretti Claudio Sangregorio Fabio Canepa Petr Chernavsky Nikolai Perov Davide Peddis |
| author_sort | Alexander Omelyanchik |
| collection | DOAJ |
| description | Cobalt ferrite nanoparticles of different stoichiometries synthesized by a sol–gel autocombustion method were used as a starting material to obtain high-moment Fe<sub>50</sub>Co<sub>50</sub> and Fe<sub>66</sub>Co<sub>34</sub> metal nanoparticles by topochemical hydrogen reduction. Structural and magnetic investigations confirmed the formation of FeCo nanoparticles with crystallite sizes of about 30 nm and magnetization at 0.5 T of ~265 Am<sup>2</sup>/kg (0 K), which was larger than the expected bulk value, likely because of the incorporation in the body-centered cubic (bcc) FeCo structure of the residual C atoms present on the surface of the oxide particles. Temperature-dependent magnetization measurements in the H<sub>2</sub> atmosphere were also performed to investigate in detail the reduction mechanism and the effect of an external magnetic field on the process efficiency. |
| first_indexed | 2024-03-09T22:42:13Z |
| format | Article |
| id | doaj.art-09d89ae301f647b7a56067c308183e67 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T22:42:13Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-09d89ae301f647b7a56067c308183e672023-11-23T18:35:55ZengMDPI AGApplied Sciences2076-34172022-02-01124189910.3390/app12041899High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H<sub>2</sub> Reduction of Co-FerritesAlexander Omelyanchik0Gaspare Varvaro1Pierfrancesco Maltoni2Valeria Rodionova3Jean-Pierre Miranda Murillo4Federico Locardi5Maurizio Ferretti6Claudio Sangregorio7Fabio Canepa8Petr Chernavsky9Nikolai Perov10Davide Peddis11Department of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyConsiglio Nazionale delle Ricerche, nM<sup>2</sup>-Lab, Istituto di Struttura della Materia, Monterotondo Scalo, 00015 Rome, ItalyDepartment of Materials Science and Engineering, Uppsala University, P.O. Box 35, SE-751 03 Uppsala, SwedenREC “Smart Materials and Biomedical Applications”, Immanuel Kant Baltic Federal University, 236041 Kaliningrad, RussiaDepartment of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyDepartment of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyDepartment of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyIstituto di Chimica dei Composti OrganoMetallici & INSTM, 50019 Sesto Fiorentino, ItalyDepartment of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyChemical Department, Lomonosov Moscow State University, 119991 Moscow, RussiaFaculty of Physics, Lomonosov Moscow State University, 119991 Moscow, RussiaDepartment of Chemistry and Industrial Chemistry, University of Genova, 16146 Genova, ItalyCobalt ferrite nanoparticles of different stoichiometries synthesized by a sol–gel autocombustion method were used as a starting material to obtain high-moment Fe<sub>50</sub>Co<sub>50</sub> and Fe<sub>66</sub>Co<sub>34</sub> metal nanoparticles by topochemical hydrogen reduction. Structural and magnetic investigations confirmed the formation of FeCo nanoparticles with crystallite sizes of about 30 nm and magnetization at 0.5 T of ~265 Am<sup>2</sup>/kg (0 K), which was larger than the expected bulk value, likely because of the incorporation in the body-centered cubic (bcc) FeCo structure of the residual C atoms present on the surface of the oxide particles. Temperature-dependent magnetization measurements in the H<sub>2</sub> atmosphere were also performed to investigate in detail the reduction mechanism and the effect of an external magnetic field on the process efficiency.https://www.mdpi.com/2076-3417/12/4/1899magnetic nanoparticlesmetal nanoparticleshydrogen reductionmagnetic materials |
| spellingShingle | Alexander Omelyanchik Gaspare Varvaro Pierfrancesco Maltoni Valeria Rodionova Jean-Pierre Miranda Murillo Federico Locardi Maurizio Ferretti Claudio Sangregorio Fabio Canepa Petr Chernavsky Nikolai Perov Davide Peddis High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H<sub>2</sub> Reduction of Co-Ferrites Applied Sciences magnetic nanoparticles metal nanoparticles hydrogen reduction magnetic materials |
| title | High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H<sub>2</sub> Reduction of Co-Ferrites |
| title_full | High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H<sub>2</sub> Reduction of Co-Ferrites |
| title_fullStr | High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H<sub>2</sub> Reduction of Co-Ferrites |
| title_full_unstemmed | High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H<sub>2</sub> Reduction of Co-Ferrites |
| title_short | High-Moment FeCo Magnetic Nanoparticles Obtained by Topochemical H<sub>2</sub> Reduction of Co-Ferrites |
| title_sort | high moment feco magnetic nanoparticles obtained by topochemical h sub 2 sub reduction of co ferrites |
| topic | magnetic nanoparticles metal nanoparticles hydrogen reduction magnetic materials |
| url | https://www.mdpi.com/2076-3417/12/4/1899 |
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