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Size dependence of structural, magnetic, and electrical properties in corundum-type Ti2O3 nanoparticles showing insulator–metal transition
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Brown corundum dust is a solid waste produced during the preparation of brown corundum with bauxite as the raw material. The dust has a relatively high gallium content; therefore, it is of great value to recover the gallium from this kind of dust. In this paper, a range of analysis and characterization methods, including XRD, XRF, SEM …
Fuchsite is a green variety of muscovite mica that on rare instances contains tiny red corundum crystals (ruby). These inspire the name ruby-in-fuchsite. We explain how to separate ruby-in-fuchsite from ruby-in-zoisite.
The disintegration properties of the corundum-based abrasive were monitored by sieving and optical test methods. Particle identification after cutting process (grain or chip) was realized by energy-dispersive X-ray microanalysis (EDX).
The recovery of hematite fines from quartz and corundum using selective magnetic coating was studied as a function of pH, particle size, magnetic colloidal concentration, magnetic field strength and ratio of hematite:quartz. Synthetic mixtures assaying around 45–72% Fe 2 O 3 was upgraded to 90–92% with recovery level of …
various colored synthetic corundum have been produced by hydrothermal method, Czochralski pulling technique and floating-zone process or solution-growth method include flux process, and melt-growth method. Synthetic corundum is produced from pure alpha aluminum oxide free from potash (corresponds to white sapphire, which is known as …
Following magnetic separation of the concentrate, corundum and zircon remain. The concentrate initially is sieved into different size fractions based on the pearl sieve size system, an example of which is given in Table 1.
In the preceding section, we learned that a current creates a magnetic field. If nature is symmetrical, then perhaps a magnetic field can create a curre...
Brown corundum dust, which is created during the manufacturing of brown corundum using bauxite as the raw material, is a vital carrier of gallium. To ascertain the presence of the contained gallium, the brown corundum dust was measured and characterized (XRF, XRD, ICP-OES, EPMA, SEM-EDS, etc.). Gallium was extracted …
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A new magnetic insulator Mn2MnSbO6 with a polar crystal structure and an ordered Mn2+ and Mn3+ arrangement was synthesized under a high pressure of 7.5 GPa and 1300 °C. The crystal structure of ...
This approach was used to determine the efect of magnetic contributions to corundum-eskolaite and corundum-hematite phase equilibria from first principles. Two-component cluster expansions of the magnetic components of eskolaite and hematite were first performed showing the ability of this method to properly calculate their respective …
Request PDF | On Dec 1, 2022, Akbar Ali and others published Investigations of the structural, magnetic, mechanical, electronic and ferroelectric properties of Mn2MnWO6 double corundum oxide ...
Jing Wang, Rundong Li, Shou-Cheng Zhang, and Xiao-Liang Qi Phys. Rev. Lett. 106, 126403 — Published 24 March 2011 DOI: 10.1103/PhysRevLett.106.126403
Magnetic Anisotropy in Antiferromagnetic Corundum-Type Sesquioxides. Evaluations of the magnetic dipolar anisotropy K MD are made for the antiferromagnetic Cr, Fe, Ti, and V sesquioxides isomorphous to α-Al 2 O 3. In the first two systems the fine structure anisotropy K FS is found by substracting K MD from the total anisotropy K obtained from ...
Corundum. Corundum is an aluminum oxide mineral of the oxides and hydroxides group, with structural formula Al2O3. The structure consists essentially of a dense arrangement of oxygen ions in hexagonal closest-packing with Al3+ ions in two-thirds of the available octahedral sites. Because Al is trivalent, each oxygen atom is bonded to only two ...
Corundum, also known as aluminum oxide, is not magnetic. It is a diamagnetic material, meaning it does not have any magnetic properties and is very weakly repelled by magnetic fields.
Additionally, in this study, a tubular furnace prepares the Shenhua coal semi-char (SHC). First, 1.0 g coal with a size of 75–150 μm are spread evenly on the corundum magnetic boat bottom, and the corundum magnetic boat is pushed into the furnace.
Sapphires and rubies are both gem varieties of the mineral corundum. They have the same chemical composition and structure. Gems generally get their colour because of certain metals or impurities contained in the mineral. The impurities in corundum gems produce the large range of colours found. Sapphire and ruby crystals …
Flue dust generated during the process of manufacturing corundum is a carrier of critical metal gallium. In this study, a process of alkali leaching-carbonation-acid leaching-solvent extraction was developed to recover and enrich gallium from corundum flue dust. Over 93% of the gallium in corundum flue dust could be recovered …
Size dependence of structural, magnetic, and electrical properties in corundum-type Ti2O3 nanoparticles showing insulator–metal transition
Aluminium oxide possesses various fascinating properties allowing to use corundum (α-Al 2 O 3) for different applications in science and technology. Because of high tolerance against heavy ...
This approach was used to determine the effect of magnetic contributions to corundum-eskolaite and corundum-hematite phase equilibria from first principles.
Semantic Scholar extracted view of "Magnetic Anisotropy in Antiferromagnetic Corundum-Type Sesquioxides" by J. Artman et al.
Corundum is a crystalline form of aluminum oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems such as sapphires and rubies.
The ultimate goal is for you of to fill out the data table on page 8 as completely as possible and in the process of filling out this table you should learn how to identify some of the more common minerals that exist in nature.
CORUNDUM AND ITS USES.1. THE three works cited below give much new and valuable information concerning the mode of occur rence, the processes of mining, and the uses of corundum. As the mineral is ...
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Nizankowski, C. Influence of the abradant's composition on the selected physical properties in the process of front grinding of surfaces with microcrystalline sintered corundum grinding wheels.
Origin of corundum-normative intrusive and extrusive magmas. of the magma. A number of explanations have been proposed for these trends, including secondary alteration, vapour phase transfer ...
Polar magnetic oxides are technologically of great interest due to their promising applications in futuristic electronic devices, but they are very rare due to the co-existence of contraindicating important physical features such as magnetization and polarization. In this study, polar corundum double oxides Mn 2 ScMO 6 (M = Nb, Ta) in non …
Corundum-type Ti 2 O 3 has been investigated over the last half century because it shows unusual insulator–metal (I-M) transition over a broad temperature range (420–550 K). In this work, we successfully synthesized Ti 2 O 3 nanoparticles (20, 70, 300 nm in size) by the low-temperature reduction between precursors of rutile-type TiO 2 and …
The whole-powder metallurgy process included strip casting, hydrogen decrepitation, milling (mechanical activation) and sintering. The results show the possibility of using a unified initial alloy for the manufacture of magnets with …
Abstract. Evaluations of the magnetic dipolar anisotropy are made for the antiferromagnetic Cr, Fe, Ti, and V sesquioxides isomorphous to . In the first two systems the fine structure anisotropy is found by substracting from the total anisotropy obtained from antiferromagnetic-resonance (AFMR) data. In Shull magnetic configuration type (c), of ...
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Corundum Value, Price, and Jewelry Information. Next to diamond, corundum is the hardest mineral known and is very compact and dense, with no cleavage. As a result, corundum is one of the best of all jewelry stones, especially star corundum, which is tough as well as scratch-resistant. Faceted gems are slightly brittle and can be chipped ...
Semantic Scholar extracted view of "A Polar Magnetic and Insulating Double Corundum Oxide: Mn2MnSbO6 with Ordered Mn(II) and Mn(III) Ions" by H. Feng et al.
