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The manuscript shows the studies of structural and magnetic properties of BaTiO 3 /Fe 2 O 3 samples prepared using five different chemical routes. We show that the undertaken processes leaded to the decoration of BaTiO 3 grains with hematite nanoparticles, but not to a creation of a well-defined core-shell structure. These studies …
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Fe₂O₃ is Corundum structured and crystallizes in the trigonal R̅3c space group. Fe³⁺ is bonded to six equivalent O²⁻ atoms to form a mixture of distorted face, corner, and edge-sharing FeO₆ octahedra. The corner-sharing octahedral tilt angles range from 48–61°. There are three shorter (1.97 Å) and three longer (2.12 Å) Fe–O bond lengths. O²⁻ is bonded to …
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The chemical formula of hematite is Fe2O3 whereas the electronic configuration of iron and oxygen are: Iron: 1s22s22p63s23p63d64s2 Oxygen: 1s22s22p4. From the electronic configurations of iron and oxygen, it can be figured out there will be a deficiency of paired electrons which promotes paramagnetic behavior in hematite.
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Finally, some of the current challenges and future perspectives for α-Fe2O3 nanotubes are discussed. We believe that this timely and critical mini-review will stimulate extensive studies and attract more attention, further improving the development of the α-Fe2O3 (hematite) nanotube structure.
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An ab initio model of electron transport in hematite (α-Fe2O3) basal planes. K. Rosso, Dayle M. Smith, M. Dupuis. Published 27 March 2003. Chemistry. Journal of Chemical Physics. Transport of conduction electrons through basal planes of the hematite lattice was modeled as a valence alternation of iron cations using ab initio molecular …
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Hematite (α-Fe 2 O 3) is a promising material for solar water splitting. However, its performance as a photoanode has been crucially limited by poor optoelectronic properties. Recent advances in nanostructuring and surface chemistry have catalyzed a rapid advance in the performance of this promising solar energy conversion material. Here the ...
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A review of the α-Fe 2 O 3 (hematite) nanotube structure: recent advances in synthesis, characterization, and applications ... α-Fe2O3 nanotubes are exceptional one-dimensional transition metal oxide materials with low density, large surface area, …
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Hematite α-Fe2O3 with microrods and nanoparticles, corresponding to the predominantly exposed (110) and (104) facets, respectively, were prepared using a hydrothermal-annealing approach. The crystal plane effects of prepared α-Fe2O3 on the catalytic performance towards thermal decomposition of ammonium perchlorate (AP) …
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This article reviewed the hematite α-Fe 2 O 3, which focuses on its material properties, nanostructures, synthesis techniques, and its numerous applications. Researchers prepared the hematite nanostructure using the synthesis methods, such as hydrothermal, and, further, enhanced it by improving the techniques to accommodate the best performance for …
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Hematite (α-Fe2O3) based photoanodes offer promise for such applications, due to their high chem. stability, great abundance and low cost. Despite these promising properties, progress towards the manuf. of practical water splitting devices has been limited. This review is intended to highlight recent advancements and the limitations …
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Hematite (α-Fe2O3) nanoparticles have been successfully synthesized via two methods: (1) polyol and (2) precipitation in water. The influence of synthesis methods on the crystalline structure, morphological, optical, magnetic and electrical properties were investigated using X-ray diffraction, RAMAN spectroscopy, scanning electron …
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[1] First-order reversal curve (FORC) diagrams have become a standard tool in rock magnetism, yet magnetite is the only magnetic mineral that is well characterized using FORC diagrams. We present FORC diagrams for predominantly single-domain (SD) synthetic aluminous hematite (α-Fe 2-x Al x O 3) and goethite (α-(FeAl)OOH) and natural …
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Hematite is a naturally abundant magnetic mineral that is encountered commonly in such studies, so it is important to have extensive FORC reference data for this mineral. We present the most comprehensive available FORC study of diverse natural and synthetic hematite samples, including numerical simulation results, to seek to explain key …
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Nano-sized hematite (α-Fe2O3) is not well suited for magnetic heating via an alternating magnetic field (AMF) because it is not superparamagnetic—at its best, it is weakly ferromagnetic. However, manipulating the magnetic properties of nano-sized hematite (i.e., magnetic saturation (Ms), magnetic remanence (Mr), and coercivity (Hc)) …
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Hematit může také nastat v nepřítomnosti vody, obvykle v důsledku sopečné činnosti. Krystaly hematitu velikosti jílu se mohou vyskytovat také jako sekundární minerál vznikající zvětráváním v půdě a spolu s dalšími oxidy železa nebo oxyhydroxidy, jako je goethit, který je zodpovědný za červenou barvu mnoha tropických, starověkých nebo jinak vysoce …
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