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Magnetite
About: Magnetite is a research topic. Over the lifetime, 10277 publications have been published within this topic receiving 278071 citations.
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TL;DR: An innovative quantitative synthetic method for preparing magnetite nanoparticles was achieved by co-precipitation in aqueous solution using only one single iron(III) salt as a precursor.
156 citations
TL;DR: A series of modified ferrites were prepared by doping iron oxide with various transition/non-transition/innertransition metal ions [M = Cr, Mn, Co, Ni, Cu, Zn and Ce] in situ during synthesis as discussed by the authors.
Abstract: A series of modified ferrites were prepared by doping iron oxide with various transition/non-transition/inner-transition metal ions [M = Cr, Mn, Co, Ni, Cu, Zn and Ce] in situ during synthesis. All the modified ferrites thus obtained exhibit remarkably high surface areas, greater than that of pure iron oxide (Fe2O3) sample. The efficacy of the dopant ions in modifying the resultant specific surface area, could be directly related to variations in the rate of crystal growth. The nature and concentration of the foreign cations present in the system govern this variation. Interestingly all the modified ferrites, exhibit a narrow pore size distribution in the range of 4.9–25 nm. XRD analysis revealed the existence of hematite (Fe2O3) phase in all the as-prepared samples. The X-ray diffraction experiments performed on activated catalysts, confirmed the existence of magnetite (Fe3O4) phase with a nominal composition of Fe2.73M0.27O4. These inverse or mixed spinels with general formula A(1−δ)Bδ[AδB(2−δ)]O4, possess highly facile Fe3+ ⇔ Fe2+ redox couple, the degree of facileness depends on the extent of synergistic interaction between iron and the other substitutent metal ion. The rapid electron hopping between Fe3+ ⇔ Fe2+ in the Fe3O4 lattice system is essential to catalyze WGS reaction. From TPR it was observed that, incorporation of metal cations into the hematite (α-Fe2O3) crystal structure alters the reducibility of the hematite particles, which in turn depends on the nature of the incorporated metal cation. A plausible explanation for the WGS activity over various modified ferrites has been attempted with the help of TPR analysis.
156 citations
TL;DR: In this paper, the authors measured the d 56 Fe values of bulk granitic and volcanic rocks, as well as magnetite and Fe silicates, and showed that loss of a low-d 56 Fe ferrous chloride fluid is the most likely explanation for the high d 56Fe values in the bulk rocks.
156 citations
TL;DR: In this article, a magnetite ferrofluid coated by dextran with a high specific absorption rate (SAR) of 75 W/g in an AC field of 55 kHz and 200 Oe was prepared by the gel crystallization method with ultrasonic treatment.
155 citations
TL;DR: In this paper, the preservation of magnetotactic bacterial magnetite has been investigated in Eocene pelagic carbonates from the southern Kerguelen Plateau, Southern Ocean.
155 citations