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Structural characterization and magnetic properties of undoped and copper-doped cobalt ferrite nanoparticles prepared by the octanoate coprecipitation route at very low dopant concentrations

Kamta Tedjieukeng, Hypolite Mathias and Kenfack Tsobnang, Patrice and Lontio Fomekong, Roussin and Ekane Etape, Peter and Joy, Pattayil and Delcorte, Arnaud and Lambi Ngolui, John (2018) Structural characterization and magnetic properties of undoped and copper-doped cobalt ferrite nanoparticles prepared by the octanoate coprecipitation route at very low dopant concentrations. RSC Advances, pp. 38621-38630. Royal Society of Chemistry. DOI: 10.1039/c8ra08532c ISSN 2046-2069

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Official URL: https://pubs.rsc.org/en/content/articlelanding/2018/ra/c8ra08532c#!divAbstract

Abstract

Nanoparticles of undoped and copper-doped cobalt ferrite Co1−xCuxFe2O4 at very low dopant concentrations (x = 0; 0.02; 0.04; 0.06; 0.08) were successfully synthesized by pyrolysis of the corresponding hetero metal octanoate precursors obtained via coprecipitation using the octanoate ligand as precipitating agent. The precursors were then characterized by FTIR, ICP-AES and TG-DTA analyses and the results reveal the formation of a copper-cobalt-iron hydroxooctanoate represented by the formula [Co1−xCuxFe2(C8H15O2)6(OH)2·2H2O]. The decomposition products obtained upon pyrolysis in air at 400 °C for 3 h were characterized by FTIR, XRD, SEM, TEM, XPS and VSM analyses. FTIR and XRD analyses showed the formation of a single phase mixed spinel ferrite while TEM analysis showed that the particles have a spherical shape with a mean size of 20 nm and form spherical agglomerates with sizes reaching 500 nm in some cases as the SEM images show. The chemical states of the metallic species in the samples were revealed by XPS to be Cu2+, Co2+ and Fe3+. These results combined with XRD confirmed the mixed spinel structure, Co1−xCuxFe2O4 in which Cu2+ ions substitute Co2+ ions in tetrahedral sites for x lower than 0.06 and in octahedral sites for x between 0.06 and 0.08. Magnetic parameters such as saturation magnetization (Ms), coercivity (Hc), remanent magnetization (Mr), magnetocrystalline anisotropy constant (K) and reduced magnetization (Mr/Ms), obtained from magnetic hysteresis loops measured at room temperature, are in agreement with this mixed spinel structure and also indicate that these materials are ferromagnetic and could be good candidates for applications in biomedicine and in microwave devices.

Item URL in elib:https://elib.dlr.de/129577/
Document Type:Article
Title:Structural characterization and magnetic properties of undoped and copper-doped cobalt ferrite nanoparticles prepared by the octanoate coprecipitation route at very low dopant concentrations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kamta Tedjieukeng, Hypolite MathiasHigher Teacher Training Collegehttps://orcid.org/0000-0003-4523-310X
Kenfack Tsobnang, PatriceUniversity of Dschanghttps://orcid.org/0000-0002-1888-0099
Lontio Fomekong, RoussinRoussin.LontioFomekong (at) dlr.dehttps://orcid.org/0000-0002-0470-9696
Ekane Etape, PeterUniversity of BueaUNSPECIFIED
Joy, PattayilNational Chemical Laboratoryhttps://orcid.org/0000-0003-2125-0976
Delcorte, ArnaudUniversität Katholique LouvainUNSPECIFIED
Lambi Ngolui, JohnHigher Teacher Training CollegeUNSPECIFIED
Date:16 November 2018
Journal or Publication Title:RSC Advances
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1039/c8ra08532c
Page Range:pp. 38621-38630
Publisher:Royal Society of Chemistry
ISSN:2046-2069
Status:Published
Keywords:copper-doped cobalt ferrite, nanoparticles, co-precipitation, octanoate, magnetic properties
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials, E - Gas Turbine
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Lontio Fomekong, Roussin
Deposited On:06 Nov 2019 16:08
Last Modified:20 Jan 2020 10:31

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