A systematic study of the structural and magnetic properties of Mn-, Co-, and Ni-Doped Colloidal Fe3O4 nanoparticles

Autor: Kolen’ko, Yury V., Bañobre-López, Manuel, Deepak, Francis Leonard, Carbó-Argibay, Enrique, Rodríguez-Abreu, Carlos, Cerqueira, M. F., Piñeiro-Redondo, Yolanda, Kamali, Saeed, Kovnir, Kirill, Rivas, José
Přispěvatelé: Universidade do Minho
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Popis: A series of colloidal MxFe3-xO4 (M = Mn, Co, Ni; x = 0–1) nanoparticles with diameters ranging from 6.8 to 11.6 nm was synthesized by hydrothermal reaction in aqueous medium at low temperature (200 °C). Energy-dispersive X-ray microa-nalysis and inductively coupled plasma spectrometry confirms that the actual elemental compositions agree well with the nominal ones. The structural properties of obtained nanoparticles were investigated by using powder X-ray diffraction, Raman scattering, Mössbauer spectroscopy, and electron microscopy. The results demonstrate that our synthesis technique leads to the formation of chemically uniform single-phase solid solution nanoparticles with cubic spinel structure, confirming the intrinsic doping. Magnetic studies showed that, in comparison to Fe3O4, the saturation magnetization of MxFe3-xO4 (M = Mn, Ni) decreases with increasing dopant concentration, while Co-doped samples showed similar saturation magnetizations. On other hand, whereas Mn- and Ni-doped nanoparticles exhibits superparamagnetic behavior at room temperature, ferromagnetism emerges for CoxFe3-xO4 nanoparticles, which can be tuned by the level of Co doping.
We are thankful to Dr. L. M. Salonen and Prof. P. Freitas (both INL) for helpful discussions, as well as to the manuscript reviewers for providing useful comments on the manuscript. We would also like to thank the ORNL NOMAD mail-in program (Proposal ID IPTS-10113) and, specifically, Dr. J. Neuefeind and Dr. M. Feygenson for the collection of PDF data. This work has benefited from the financial support provided by the ERDF (ON.2 - O Novo Norte Program), EU FP7 Cooperation Programme through NMP-theme (Grant No. 314212), and InveNNta project financed by EU Programme for Cross-border Cooperation: Spain-Portugal. Research conducted at ORNL’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02- 06CH11357. The Mössbauer facility was supported by NIH (Grant No. 1S10RR023656-01A1). E.C.-A. acknowledges the I2C Plan (Xunta de Galicia, Spain) for a postdoctoral fellowship.
Databáze: OpenAIRE
Externí odkaz: