Nanostructured (CoxFe1-x)(3-y)O-4 spinel - mechanochemical synthesis
Wu, E.1,2; Campbell, S. J.1; Kaczmarek, W. A.1,3; Hofmann, M.4,5; Kennedy, S. J.6
Corresponding AuthorCampbell, S. J.(
AbstractThe effects of wet-milling mixtures of alpha-Fe2O3 and cobalt hydroxide Co(OH)(2) over a range of Co/Fe ratios for 215 h have been investigated by neutron diffraction and Mossbauer spectroscopy. The starting materials were mixed according to the stoichiometric formula (CoxFe1 -x)(3)O-4 for values of x = 0.037, 0.071, 0.133, 0.234 and 0.380 (i. e., from approximate to Co0.1Fe2.9O4 to the cobalt spinel CoFe2O4). These studies reveal the formation of a nanostructured, mixed Co-Fe spinel phase with non-stoichiometric composition (CoxFe1- x)(3 -y)O-4; the defect spinels have refined values x(c) = 0.04, 0.08 and 0.14 for the mixtures with the lowest Co content (x = 0.037, 0.071 and 0.133) and defect concentrations in the range y approximate to 0.1 -0.2. Both the spinel phase and un-reacted alpha-Fe2O3 are found to occur in the neutron diffraction patterns and Mossbauer spectra for the high Co content mixtures x = 0.234 and x = 0.380. Rietveld refinements of the neutron data indicate that the Co atoms predominantly occupy the octahedral B sites with vacancies also found to be located on the octahedral B sites. Analyses of the Mossbauer spectra of the milled samples confirm the existence of vacancy defects in the B sites and reveal that the vacancies cause similar effects to those of the Co ions, leading to a higher average charge state per iron atom.
KeywordNanostructured ferrites Mossbauer spectroscopy Neutron diffraction (CoxFe1-x)(3-y)O-4
Funding OrganizationAustralian Research Council ; Australian Institute of Nuclear Science and Engineering
Indexed BySCI
Funding ProjectAustralian Research Council ; Australian Institute of Nuclear Science and Engineering
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000752227500013
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Document Type期刊论文
Corresponding AuthorCampbell, S. J.
Affiliation1.Univ New South Wales, Australian Def Force Acad, Sch Phys Environm & Math Sci, Canberra, ACT 26000, Australia
2.Chinese Acad Sci, Inst Met Res, Beijing, Peoples R China
3.Australian Natl Univ, Res Sch Phys Sci & Engn, Canberra, ACT, Australia
4.Tech Univ Munich, Garching, Germany
5.Rutherford Appleton Lab, ISIS Facil, Didcot, Oxon, England
6.Australian Nucl Sci & Technol Org, Menai, NSW, Australia
Recommended Citation
GB/T 7714
Wu, E.,Campbell, S. J.,Kaczmarek, W. A.,et al. Nanostructured (CoxFe1-x)(3-y)O-4 spinel - mechanochemical synthesis[J]. INTERNATIONAL JOURNAL OF MATERIALS RESEARCH,2022,94(10):1127-1133.
APA Wu, E.,Campbell, S. J.,Kaczmarek, W. A.,Hofmann, M.,&Kennedy, S. J..(2022).Nanostructured (CoxFe1-x)(3-y)O-4 spinel - mechanochemical synthesis.INTERNATIONAL JOURNAL OF MATERIALS RESEARCH,94(10),1127-1133.
MLA Wu, E.,et al."Nanostructured (CoxFe1-x)(3-y)O-4 spinel - mechanochemical synthesis".INTERNATIONAL JOURNAL OF MATERIALS RESEARCH 94.10(2022):1127-1133.
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