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Crystallinity depends on choice of iron salt precursor in the continuous hydrothermal synthesis of Fe–Co oxide nanoparticles

Jian Liu, Isabella Römer, Selina Vi Yu Tang, Eugenia Valsami-Jones, Richard Palmer Orcid Logo

RSC Advances, Volume: 7, Issue: 59, Pages: 37436 - 37440

Swansea University Author: Richard Palmer Orcid Logo

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DOI (Published version): 10.1039/C7RA06647C

Abstract

A series of Fe–Co oxide nanoparticles (NPs) were prepared by a continuous hydrothermal method using iron nitrate and ammonium iron citrate as alternative iron precursors. The crystallinity, Fe/Co composition and element spatial distribution in the synthesised NPs were investigated using X-ray diffra...

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Published in: RSC Advances
ISSN: 2046-2069
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34966
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Abstract: A series of Fe–Co oxide nanoparticles (NPs) were prepared by a continuous hydrothermal method using iron nitrate and ammonium iron citrate as alternative iron precursors. The crystallinity, Fe/Co composition and element spatial distribution in the synthesised NPs were investigated using X-ray diffraction (XRD), aberration-corrected scanning transmission electron microscopy (ac-STEM) imaging, energy-dispersive X-ray spectroscopy (EDX) and electron energy loss spectroscopy (EELS). Strong dependence on the choice of iron salt was observed. We demonstrate that the presence of ammonium citrate markedly improves the crystallinity of the NPs; an ordered cobalt ferrite alloy is formed. We suggest this is due to the formation of a homogenous reaction environment during the thermal decomposition of ammonium citrate, and the formation of complexes among citrate, Fe and Co ions.
College: College of Engineering
Issue: 59
Start Page: 37436
End Page: 37440