Probing the site occupancies of Co-, Ni-, and Mn-substituted biogenic magnetite using XAS and XMCD
-
Victoria S. Coker
,
Carolyn I. Pearce
Abstract
Ferrimagnetic nanoparticles have many uses in industry including in magnetic recording media and transformers, however these particles are often expensive to synthesize. In this study, the Fe3+- reducing bacteria Geobacter sulfurreducens and Shewanella oneidensis were used to synthesize spinel ferrite nanoparticles of the general chemical formula MxFe3-xO4, where M is either Co, Ni, Mn, Zn, or a combination of Mn and Zn. This was done at ambient temperatures through the dissimilatory reduction of Fe3+-oxyhydroxides containing the appropriate substitutional cations. A combination of L-edge and K-edge X-ray absorption spectroscopy (XAS) and L-edge X-ray magnetic circular dichroism (XMCD) was used to determine the site occupancies, valence, and local structure of the Fe and substitutional cations within the spinels. The Ni and Co ferrites produced using each bacterium were very similar and therefore this study concludes that, despite the difference in reduction mechanism of the bacteria used, the end-product is remarkably unaltered. Nickel ferrites contained only Ni2+, with at least 80% in Oh coordination. Cobalt ferrites contained only Co2+ but with a significant proportion (up to 45%) in Td coordination, showing a slight preference for Td sites. The Mn-ferrites contained Mn2+ only on the Oh sites but a mixture of Mn2+ and Mn3+ on Td sites when the amount of Mn exceeded 3% (compared to the amount of Fe) or some Zn was also present. This study successfully produced a range of nanoparticulate ferrites that could be produced industrially using relatively environmentally benign methodologies.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Rietveld structure refinement of MgGeO3 post-perovskite phase to 1 Mbar
- High-temperature ammonium white mica from the Betic Cordillera (Spain)
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- The crystal chemistry of Li in gadolinite
- The effect of the hedenbergitic substitution on the compressibility of jadeite
- The structure of monohydrocalcite and the phase composition of the beachrock deposits of Lake Butler and Lake Fellmongery, South Australia
- First-principles calculation of the infrared spectrum of hematite
- In situ observations of muscovite dissolution under alkaline conditions at 25–50 °C by AFM with an air/fluid heater system
- Ramanite-(Cs) and ramanite-(Rb): New cesium and rubidium pentaborate tetrahydrate minerals identified with Raman spectroscopy
- Pressure-temperature studies of talc plus water using X-ray diffraction
- Hematite and magnetite precipitates in olivine from the Sulu peridotite: A result of dehydrogenation-oxidation reaction of mantle olivine?
- Arsenide in a metasomatized peridotite xenolith as a constraint on arsenic behavior in the mantle wedge
- Multiple oxygen sites in synthetic phyllosilicates with expandable layers: 17O solid-state NMR study
- On the existence of a Na-deficient monoclinic trinepheline with composition Na7.85Al7.85Si8.15O32
- Chlorite and biotite weathering, Fe2+-rich corrensite formation, and Fe behavior under low Po₂ conditions and their implication for Precambrian weathering
- Structural characterization of natural UO2 at pressures up to 82 GPa and temperatures up to 2200 K
- Dense hydrous magnesium silicates, phase D, and superhydrous B: New structural constraints from one- and two-dimensional 29Si and 1H NMR
- Mid-IR bands of synthetic calcic amphiboles of tremolite-pargasite series and of natural calcic amphiboles
- Probing the site occupancies of Co-, Ni-, and Mn-substituted biogenic magnetite using XAS and XMCD
- Origin of titanite in metarodingite from the Zagros Thrust Zone, Iraq
- Experimental calibration of aluminum partitioning between olivine and spinel as a geothermometer
- Single-crystal X-ray diffraction study of CaIrO3
- Orthorhombic polymorph of rengeite from Ohmi region, central Japan
- New insights into the crystal chemistry of epididymite and eudidymite from Malosa, Malawi: A single-crystal neutron diffraction study
- Mechanisms of rhyolitic glass hydration below the glass transition
- Heat capacity and entropy of melanophlogite: Molecule-containing porosils in nature
- Crystal structure of glaucodot, (Co,Fe)AsS, and its relationships to marcasite and arsenopyrite
- Modification of gas speciation in quartz-hosted fluid inclusions by stray laser radiation during LA-ICPMS analysis
- A PH₂O-dependent structural phase transition in the zeolite natrolite
Articles in the same Issue
- Rietveld structure refinement of MgGeO3 post-perovskite phase to 1 Mbar
- High-temperature ammonium white mica from the Betic Cordillera (Spain)
- Synthesis and crystal structure of the feldspathoid CsAlSiO4: An open-framework silicate and potential nuclear waste disposal phase
- The crystal chemistry of Li in gadolinite
- The effect of the hedenbergitic substitution on the compressibility of jadeite
- The structure of monohydrocalcite and the phase composition of the beachrock deposits of Lake Butler and Lake Fellmongery, South Australia
- First-principles calculation of the infrared spectrum of hematite
- In situ observations of muscovite dissolution under alkaline conditions at 25–50 °C by AFM with an air/fluid heater system
- Ramanite-(Cs) and ramanite-(Rb): New cesium and rubidium pentaborate tetrahydrate minerals identified with Raman spectroscopy
- Pressure-temperature studies of talc plus water using X-ray diffraction
- Hematite and magnetite precipitates in olivine from the Sulu peridotite: A result of dehydrogenation-oxidation reaction of mantle olivine?
- Arsenide in a metasomatized peridotite xenolith as a constraint on arsenic behavior in the mantle wedge
- Multiple oxygen sites in synthetic phyllosilicates with expandable layers: 17O solid-state NMR study
- On the existence of a Na-deficient monoclinic trinepheline with composition Na7.85Al7.85Si8.15O32
- Chlorite and biotite weathering, Fe2+-rich corrensite formation, and Fe behavior under low Po₂ conditions and their implication for Precambrian weathering
- Structural characterization of natural UO2 at pressures up to 82 GPa and temperatures up to 2200 K
- Dense hydrous magnesium silicates, phase D, and superhydrous B: New structural constraints from one- and two-dimensional 29Si and 1H NMR
- Mid-IR bands of synthetic calcic amphiboles of tremolite-pargasite series and of natural calcic amphiboles
- Probing the site occupancies of Co-, Ni-, and Mn-substituted biogenic magnetite using XAS and XMCD
- Origin of titanite in metarodingite from the Zagros Thrust Zone, Iraq
- Experimental calibration of aluminum partitioning between olivine and spinel as a geothermometer
- Single-crystal X-ray diffraction study of CaIrO3
- Orthorhombic polymorph of rengeite from Ohmi region, central Japan
- New insights into the crystal chemistry of epididymite and eudidymite from Malosa, Malawi: A single-crystal neutron diffraction study
- Mechanisms of rhyolitic glass hydration below the glass transition
- Heat capacity and entropy of melanophlogite: Molecule-containing porosils in nature
- Crystal structure of glaucodot, (Co,Fe)AsS, and its relationships to marcasite and arsenopyrite
- Modification of gas speciation in quartz-hosted fluid inclusions by stray laser radiation during LA-ICPMS analysis
- A PH₂O-dependent structural phase transition in the zeolite natrolite
