The synthesis of a monodisperse quaternary ferrite (FeCoCrO4) from the hot injection thermolysis of the single source precursor [CrCoFeO (O2CtBu)6(HO2CtBu)3]
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Date
2018
Authors
Abdulwahab, K.O.
Malik, M.A.
O'Brien, P.
Vitorica-Yrezabal, I.J.
Timco, G.A.
Tuna, F.
Winpenny, R.E.
Journal Title
Journal ISSN
Volume Title
Publisher
The Royal Society of Chemistry
Abstract
Monodisperse cobalt chromium ferrite (FeCoCrO4) nanoparticles have been synthesised using the trimetallic
pivalate cluster [CrCoFeO(O2CtBu)6(HO2CtBu)3]. The precursor was thermolysed in oleylamine and
oleic acid, with diphenyl ether as the solvent at 260 °C. The effect of time and the concentration of the
precursor on the stoichiometry of the phase formed and/or the morphology of the nanoparticles was
studied. The reaction time was investigated by withdrawing aliquots at different times. No products were
formed after 5 minutes and aliquots withdrawn at reaction times of less than 1 hour contain traces of iron
oxide (Fe2O3); only cubic cobalt chromium ferrite (FeCoCrO4) was obtained after one hour. Transmission
Electron Microscopy (TEM) showed that more monodisperse spherical ferrite nanoparticles (4.0 ± 0.4 nm)
were obtained at higher precursor concentrations. Magnetic measurements revealed that all the ferrite
particles are superparamagnetic at room temperature but showed large hysteresis at low temperature.
The nanoparticles were characterised by Powder X-Ray Diffraction (p-XRD) and Transmission Electron
Microscopy (TEM). A Superconducting Quantum Interference Device (SQUID) was used to analyse the
magnetic properties of the nanoparticles.
Description
Keywords
Research Subject Categories::NATURAL SCIENCES::Chemistry::Inorganic chemistry::Solid state chemistry
Citation
Abdulwahab, K. O., Malik, M. A., O'Brien, P., Vitorica-Yrezabal, I. J., Timco, G. A., Tuna, F., & Winpenny, R. E. (2018). The synthesis of a monodisperse quaternary ferrite (FeCoCrO 4) from the hot injection thermolysis of the single source precursor [CrCoFeO (O 2 C t Bu) 6 (HO 2 C t Bu) 3]. Dalton Transactions, 47(2), 376-381.