Magnetic stability against calcining of microwave-synthesized CoFe2O4 nanoparticles. (17th June 2016)

• Record Type: Journal Article
• Authors: Bartolomé, Elena; Cayado, Pablo; Solano, Eduardo; Ricart, Susagna; Gázquez, Jaume; Mundet, Bernat; Coll, Mariona; Puig, Teresa; Obradors, Xavier; Valvidares, Manuel; Herrero-Martín, Javier; Gargiani, Pierlugi; Pellegrin, Eric
• Is Part Of: New journal of chemistry. Volume 40:Number 8(2016:Aug.)
• Page Start: 6890
• Page End: 6898
• Publication Date: 2016-06-17
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c6nj00705h
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : The magnetization of microwave-synthesized CoFe2 O4 nanoparticles, after the stringent thermal treatment that would be necessary to prepare hybrid ferromagnetic–YBCO films, is preserved. Abstract : High quality CoFe2 O4 nanoparticles were synthesized using a one-pot, microwave assisted method, that allows forming stable colloidal solutions in alcoholic solvents, as required for the preparation by Chemical Solution Deposition of hybrid nanocomposite ferromagnetic-high T c YBa2 Cu3 O7 superconducting films or devices. We have investigated how the thermal process necessary for the preparation of such epitaxial nanocomposites, involving high temperatures (800 °C) and oxygen partial pressures (1 atm), affects the structure and magnetic properties of the isolated nanoparticles. The NPs were fully characterised by XRD, SQUID, STEM-EELS and XMCD at four different stages of the thermal process. Results show that, despite intermediate changes in the cation distribution occur during the process, the final NP magnetization is stable against the thermal treatment. This result opens up perspectives for the preparation of hybrid YBCO films with embedded magnetic NPs using low-cost chemical-solution methods.