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General Magnetite Information. Iron 72.36 % Fe 31.03 % FeO / 68.97 % Fe 2 O 3. Oxygen 27.64 % O. Common accessory mineral in igneous and metamorphic rocks. Can be biogenically …
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We study by Langevin molecular dynamics simulations systematically the influence of polydispersity in the particle size, and subsequently in the dipole moment, on the physical properties of ferrofluids. The polydispersity is in a first approximation modeled by a bidisperse system that consists of sm …
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STRUCTURE AND ORIGIN OF THE MAGNETITE DEPOSITS NEAR DILLSBURG, YORK COUNTY, PENNSYLVANIA2 E. C. HA•ER. INTRODUCTION. Dillsburg is a small village on the Cumberland Valley Rail- road about fifteen miles southwest of Harrisburg (see Fig. 60). It is situated just within the border of the Mesozoic belt south- ...
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The discovery of two-dimensional (2D) magnetism combined with van der Waals (vdW) heterostructure engineering offers unprecedented opportunities for creating artificial magnetic structures with ...
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Nanocomposite of magnetic Fe3O4 nanoparticles and polypyrrole was prepared under sonication by a new chemical polymerization method during which Fe3O4 nanoparticles …
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As an application of the gel–sol method especially developed for the synthesis of general monodisperse particles in large quantities, uniform hematite (α-Fe 2 O 3), magnetite (Fe 3 O 4), and maghemite (γ-Fe 2 O 3) particles, precisely controlled in size, aspect ratio, and internal structure, have been prepared.For the synthesis of uniform ellipsoidal single-crystal …
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This study aimed to characterize cerebral structure and perfusion changes in different subtype of SSc patients using magnetic resonance (MR) imaging. Methods: Seventy SSc patients (46.0 ± 11.7 years, 62 females) and 30 healthy volunteers (44.8 ± 13.7 years, 24 females) were recruited and underwent brain MR imaging and Montreal Cognitive ...
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The fabrication of Fe3O4@SiO2 core-shell was prepared from natural iron sand as Fe3O4 core resource and in situ SiO2-coating method. The Fe3O4@SiO2 was synthesized via an ultrasonic route with various ratios of tetraethyl orthosilicate (TEOS) to evaluate the core-shell's morphological, pore structure, and magnetic properties. XRD and FTIR were used to …
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Magnetite is an oxide mineral with structural formula [Fe2+(Fe3+)2O4] having the spinel structure. Other minerals in the series include magnesioferrite [Mg2+(Fe3+)2O4], franklinite …
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Magnetite is a naturally occurring mineral that is one of the most common ironores and is widely distributed throughout the world. It is a black, metallic-looking mineral with a distinctive magnetic property, hence its name. Magnetite has the chemical formula Fe3O4, which means it is composed of two iron (Fe) ions combined wit…
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magnetic domain structure of bacterial magnetosomes using our field-emission electron microscope6 • This microscope has the highest lattice resolution7 hitherto reported and can observe
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The effect of organics on the structure and magnetization of electro-synthesised magnetite nanoparticles Author(s) Mosivand, S; Monzon, LMA; Ackland, K; Kazeminezhad, I; Coey, JMD Year. 2013 Is Peer Reviewed? Yes Journal. Journal of Nanoparticle Research ISSN: 1388-0764 EISSN: 1572-896X ...
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Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials publishes scientific articles related to the structural science of compounds and materials in the widest …
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Download scientific diagram | Crystal structure of (a) wustite (FeO), (b) magnetite (Fe 3 O 4 ) and (c) hematite (α-Fe 2 O 3 ). from publication: Grain Boundary in Oxide Scale During High ...
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The magnetic structures of NaCrS 2, NaCrSe 2, and AgCrSe 2 at 4.2 K have been determined by neutron diffraction. The magnetic moments of Cr 3+ (about 15 % less than the spin-only value) are perpendicular to the c axis. The moments in pseudohexagonal (110) planes are collinear, spins at a distance (−⅓,⅓,⅓) being antiparallel, spins at a distance (⅓, −⅓,⅔) …
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The structure is used to measure current in triangularly arranged conductors where magnetic interference exists at random position. First, a one-dimensional and two-dimensional sensor system based on a triangular arrangement of conductors are used to analyze the magnetic field. Then, the structure of the magnetic shielding is derived.
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In this work, transverse magnetic field annealing (TA) was performed to FeSiBNbCu nanocrystalline powder cores (NPCs), and the magnetic properties, microstructure, and magnetic domain structure were in detail studied comparing with those after normal annealing (NA), and the mechanism of the improvement of soft magnetic properties by TA …
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Third, tissues are transparent to magnetic fields, making accessory sensory structures such as lenses that focus the stimuli on receptor cells unnecessary. Receptor cells could be dispersed ...
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The structure of magnetite consists of a closed-packed oxygen arrangement with the divalent Fe2+ ion in tetrahedral (four-fold) coordination and the trivalent Fe3+ ions in octahedral (six-fold) coordination with oxygens. The structure may also be seen as layered sheets of [Fe2+,Fe3+] between closed-packed sheets of oxygens. ...
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The particles show lattice images consistent with the magnetite structure and have a hexagonal prism habit truncated by {011} and {100} planes. The particles have a high degree of crystal ...
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Thin films of magnetite are used in magnetic devices and as mentioned previously, the surface layers of other iron oxides such as hematite often convert into magnetic structure. An understanding of the surface properties is clearly important.
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Analysis of the low-temperature structure of magnetite is complicated by the presence of a high degree of pseudosymmetry. The low-temperature structure may be generated from the prototype cubic inverse spinel structure by means of small displacements. Although these displacements break most of the symmetry
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First-principles calculations are performed to study the electronic structures and topological phases of magnetic layered materials MnBi 2 Te 4, MnBi 2 Se 4, and MnSb 2 Te 4 under different film thicknesses, strains, and spin-orbit coupling (SOC) strengths. All these compounds energetically prefer the antiferromagnetic (AFM) state.
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Core-shell structure and magnetic properties of magnetite magnetic fluids stabilized with dextran X.Q. Xua,b,d,1, H. Shenb, J.R. Xua,*,J.Xuc, X.J. Lib, X.M. Xiongb a School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China b School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China c Guangzhou …
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The magnetic structure and properties of Cr 2 Ge 2 Te 6 have been determined by neutron powder diffraction and susceptibility and magnetization measurements. Below 61 K, Cr 2 Ge 2 Te 6 is ferromagnetic with spins aligned along the c axis of the cell ( mu (Cr 3+)=2.80(4) mu B at 5 K). The thermal evolution of the magnetic moments below T c is given.
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Magnetite is FeFe2O4. THE structure of the spinel group of crystals is very interesting. These crystals are cubic, and possess the greatest possible number of symmetries.
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Such bacteria have small particles of magnetite (magnetosomes) within them2,3 of various shapes3–5. We describe here the morphology and structure of bacterial magnetosomes investigated by high ...
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The effects of silica coatings of varying thicknesses on the crystal structure, the local structure, and the magnetic properties are discussed. 2. Experimental method. 2.1. Preparation of Fe 3 O 4 nanoparticles. The magnetite nanoparticles in this study were obtained from natural ironstone using a co-precipitation method. The synthesis process ...
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We report the existence of a stable twin defect in Fe3O4 thin films. By using aberration corrected scanning transmission electron microscopy and spectroscopy the atomic structure of the twin ...
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in the plots if the calculated magnetic peaks have intensities close to the observed ones. If not, change the magnetic model (use another representation or other magnetic symmetry operators) and try again. In some cases this is enough to solve the magnetic structure. In case this does not work use the method described in 5-2.
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We investigate the evolution of NOAA Active Region (AR) 11817 during 2013 August 10-12, when it developed a complex field configuration and produced four confined, followed by two eruptive, flares. These C-and-above flares are all associated with a magnetic flux rope (MFR) located along the major polarity inversion line, where shearing and converging photospheric flows are …
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Domain structures in magnetite are very sensitive to crystal imperfections, which play a major role in hysteresis and remanence by hindering the motion of domain walls. Using the Bitter colloid technique, we have observed spike and closure domains of the style predicted by Néel [1944] around nonmagnetic inclusions, chemically altered regions ...
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The cubic spinel type structure of magnetite distorts to a monoclinic superstructure with Cc space group symmetry below the T V ≈ 125 K Verwey transition 4,20. …
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The magnetite/water interface is commonly found in nature and plays a crucial role in various technological applications. However, our understanding of its structural and dynamical properties at the molecular scale remains still limited. In this study, we develop an efficient Behler-Parrinello neural network potential (NNP) for the magnetite/water system, …
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Hitherto, concerning the composition-structure-magnetic-property correlation, density functional theory calculation and ab initio molecular dynamics are still the most prevailing approaches [58, 59], but both methods can be time- and …
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X-ray diffraction patterns recorded for magnetite samples are shown in Fig. 1 (a–d). In all of the patterns, the Bragg maxima are indexed to Fe 3 O 4 (JCPDS 88-0315) which is the only phase present. The results from XRD indicate that the higher the concentration in total iron, the higher the crystallinity of the magnetite precipitate, i.e. at the same reaction …
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The anisotropic nature of the magnetite crystals synthesized by these bacteria is of particular interest. Magnetite has an inverse spinel structure based on a cubic close-packed arrangement of oxygen atoms with Fe" atoms in octahedral sites and Fe"' atoms equally distributed between both tetrahedral and octahedral inter-stices.
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Ribbon of magnetite (Fe 3 O 4)/Polyvinyl Alcohol (PVA) nanoparticles have been successfully fabricated with various concentration of PVA synthesized by co-precipitation method.Particle size of nanoparticles Fe 3 O 4 sample and ribbon Fe 3 O 4 /PVA 25% sample is about 9.34 nm and 11.29 nm, respectively. The result of Vibrating Sample Magnetometer …
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The morphology, structure and chemical composition of synthesized tin-doped nanoparticles were presented in Fig. 2.The usage of a single-step synthesis method of Sn 4+ doped magnetite nanoparticles allowed to obtain ultrafine, agglomerated Fe 3 O 4:Sn 4+ NPs (Fig. 2 a). The broad rings can be observed in the SAED pattern (Fig. 2 b), which is related to …
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A pristine magnetite (Fe3O4) specimen was studied by means of Neutron Powder Diffraction in the 273–1,073 K temperature range, in order to characterize its structural and magnetic behavior at high temperatures. An accurate analysis of the collected data allowed the understanding of the behavior of the main structural and magnetic features of magnetite as a …
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