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- W4302366243 abstract "Abstract The effects of wet-milling mixtures of α-Fe 2 O 3 and cobalt hydroxide Co(OH) 2 over a range of Co/Fe ratios for 215 h have been investigated by neutron diffraction and Mössbauer spectroscopy. The starting materials were mixed according to the stoichiometric formula (Co x Fe 1 – x ) 3 O 4 for values of x = 0.037, 0.071, 0.133, 0.234 and 0.380 (i. e., from ≈ Co 0.1 Fe 2.9 O 4 to the cobalt spinel CoFe 2 O 4 ). These studies reveal the formation of a nanostructured, mixed Co–Fe spinel phase with non-stoichiometric composition (Co x Fe 1– 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 ≈ 0.1 –0.2. Both the spinel phase and un-reacted α-Fe 2 O 3 are found to occur in the neutron diffraction patterns and Mössbauer 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 Mössbauer 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." @default.
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- W4302366243 date "2003-10-01" @default.
- W4302366243 modified "2023-10-18" @default.
- W4302366243 title "Nanostructured (Co x Fe1– x )3–y O4 spinel – mechanochemical synthesis" @default.
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- W4302366243 doi "https://doi.org/10.1515/ijmr-2003-0204" @default.
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