Бережная Мария Викторовна. Влияние цинка и бария на структуру и свойства нанопорошков на основе YFeO3 и LaFeO3, синтезированных золь-гель методом: дис. кандидат наук: 02.00.21 - Химия твердого тела. ФГБОУ ВО «Воронежский ...
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Complete oxidation of hydrocarbons on YFeO3 and LaFeO3 catalysts. Chemical Engineering Journal, 2013. Plamen Stefanov
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Effect of ball milling on the structure of Na +-montmorillonite and organo-montmorillonite (Cloisite 30B. Applied Clay Science, 2010. Amal Esawi. Adham Ramadan. Amal Esawi. Adham Ramadan. Download PDF. Download Full PDF Package. This paper. A short summary of …
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For Peer Review Only 1 The structure of nitrogen-supersaturated ferrite produced by ball milling J. Aufrechta, A. Leinewebera*, J. Foctb, E.J. Mittemeijera aMax Planck Institute for Metals Research, Heisenbergstrasse 3, D-70569 Stuttgart, Germany; bLaboratoire de Métallurgie Physique et Génie des Matériaux, UMR CNRS 8517, Université des Sciences et Technologies de
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With respect to the cubic perovskite structure Pnma has doubled b axis while Pbnm has doubled c axis and the transformation from Pnma to Pbnm is obtained by a 1 →b 2, b 1 →c 2 and c 1 →a 2 . The results of Rietveld refinement revealed that Y 1-x Gd x FeO 3 solid solutions with x = 0–0.4 had Pnma space group, whereas the samples with x ...
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the antiferromagnetic structure, in which the components of magnetization perpendicular to the c-axis is cancelled out Figure 3. The M–H curve for the magnetization parallel and normal to the plane of YFeO3 crystal. (a) parallel to (100), (b) normal to (100), (c) parallel to (120) and (d) normal to (120).
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The powders were heat-treated at 1000, 1300 and 1400 °C. The sample structure was characterized by X-ray diffraction (XRD), the morphology by scanning electron microscopy (SEM). For all temperatures of the heat-treatment, the YIG crystalline phase was the predominant and YFeO 3 the secondary phase. The highest percentage of YIG (≈90%) was ...
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A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints.Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic balls, flint pebbles, and stainless steel balls.
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All results show that YFeO3 synthesized by high-energy ball milling assisted with annealing possess a multiferroic behavior. ... The effect of Cr3+ doping on the YFeO3 structure and magnetic ...
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The effect of high energy ball milling under different conditions on the structure of Na +-montmorillonite (Na-MMT), and the organo-montmorillonite (Cloisite 30B) was investigated.Ball milling increased the structural disorder: peeling off of layers from the particles was observed, followed by the exfoliation of the particles, indicated by the disappearance of the (001) reflection.
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Stoichiometric mixtures of Y2O3, Fe2O3 and Bi2O3 were mixed and milled for 5 h using a ball to powder weight ratio of 10:1 by high-energy ball milling. The …
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The ball-milling experiments on the Li+2C system are described elsewhere and the main result is the synthesis of a superdense LiC 3 phase which, contrarily to the compounds prepared under high pressure, is stable under ambient pressure. This paper on the structure of LiC 3 explains this discrepancy. 2. Experimental
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Effect of Ball Milling on Magnetic Properties of Nb Substituted R2Fe16Nb1 (R: Er and Gd) Alloys, B. K. Rai and S. R. Mishra, MRS Proceeding, 2013, Volume 1516; mrsf12-1516-jj03-47
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Yttrium orthoferrite (YFeO3) powder was prepared by a mechanochemical synthesis from a mixture of Y2O3 and α-Fe2O3 powders in a planetary ball mill for 2.5 …
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Recently the effect of high energy ball milling (HEBM) treatment on hydroxyapatite with titanium and silicon has been described. During HEBM process, the impacts of the milling balls results in significant decrease of the HA particle and crystalline size, forming the nano-scale structure [23] [24].
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We present a study of multiferroic properties of YFeO3 synthesized by means of high-energy ball milling assisted by annealing at low temperature. Fe2O3 and Y2O3 powders were mixed in a stoichiometric ratio, milled for 5 h, pressed and annealed at temperature from 773 to 1073 K. X-ray diffraction (XRD) analysis confirmed the formation of single ...
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Magnetodielectric study of BiFeO
We present a study of multiferroic properties of YFeO 3 synthesized by means of high-energy ball milling assisted by annealing at low temperature. Fe 2 O 3 and Y 2 O 3 powders were mixed in a stoichiometric ratio, milled for 5 h, pressed and annealed at temperature from 773 to 1073 K. X-ray diffraction (XRD) analysis confirmed the formation of single-phase orthorhombic structure.
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12%Ball milling leads to progressive broadening of the OH band, with the BMC-120 spectrum lacking the inflection points at 3334 cm −1 observed for WMC. Meanwhile, the bands attributed to both cellulose Iα and Iβ disappeared for BMC-120, a result attributed mainly to the destruction of the crystal structure by lengthy ball milling.
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Structure factors for synthetic yttrium orthoferrite, YFeO 3, measured with MoKα (λ = 0.71073 A) X-radiation and using a smaller crystal with focused λ = 0.75 A synchrotron radiation are broadly consistent. Approximate symmetry in concordant difference densities indicates that cations deform the electron density more strongly than O atoms, although the deformation-density (Δp) map ...
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The structural transformation of polycrystalline Si induced by high energy ball milling has been studied. The structure and property characteristics of the milled powder have been investigated by x-ray diffraction, scanning electron microscopy, high-resolution electron microscopy, differential scanning calorimetry, Raman scattering, and infrared absorption spectroscopy.
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The influence of ball milling and subsequent sintering of a 3:5 molar mixture of Y 2 O 3 and α-Fe 2 O 3 on the formation of nanocrystalline Y 3 Fe 5 O 12 (YIG) particles is studied. Pre-milling the mixture for 100 h lowers the onset temperature at which the material forms to 900°C which is 200°C lower than that reported when a similar mixture of reactants was premilled for shorter times.
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We report the photocatalytic activity of Y 1-x Bi x FeO 3 (0.1 ≤ x ≤ 0.5) powders under visible light irradiation, synthesized by assisted high-energy ball milling. X-ray diffraction (XRD) and Rietveld refinement, confirm the synthesis of pure bismuth doped yttrium orthoferrite for doped levels up …
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The influence of sintering temperature on the structure, optical and magnetic properties of Yttrium iron oxide YFeO3 prepared via Lα-alanine assisted combustion method. Ceramics International, 43, (2017), pp. 8133-8138.
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Awasthi et al[98] reported the formation of carbon in different nanoparticle forms by ball-milling of graphitic carbon. Ball-milling of graphite was carried out in attritor ball mill at room temperature in hexane medium for different times i.e. 24, 48 and. The self-coagulated carbon agglomerates were obtained in the case of 24 and BMC samples.
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Similar behavior was reported by Baños et al., they demonstrated that high-energy ball milling increases internal energy of powders, reducing the temperature necessary for YIG synthesis. The precipitation of other phases can be attributed to the low solubility of Bi 3+ cations into YFeO 3 structure, accordingly the excess of Bi 3+ cations ...
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12%Nanoparticles (NPs) of orthorhombic YFeO3, has been successfully synthesized via an uncomplicated mechanochemical method from yttrium and iron chloride salts in a basic medium. The YFeO3 NPs were characterized by micro-Raman and Fourier-transform infrared spectroscopy. Their crystalline structure and average diameter of 30 nm was determined from X-ray …
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Ball milling technique, using mechanical alloying and mechanical milling approaches were proposed to the word wide in the 8th decade of the last century for preparing a wide spectrum of powder materials and their alloys. In fact, ball milling process is not new and dates back to more than 150 years. It has been used in size comminutions of ore, mineral dressing, preparing talc powders and many ...
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Ball milling is a mechanical technique widely used to grind powders into fine particles and blend materials. 18 Being an environmentally-friendly, cost-effective technique, it has found wide application in industry all over the world. Since this mini-review mainly focuses on the conditions applied for the preparation and functionalisation of ...
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The precursors mixed in a stoichiometric ratio to obtain YIG were milled at room temperature in a shaker mixer mill with a ball:powder weight ratio of 10:1. A partial synthesis of YIG was achieved after 9 h of milling time by using the three sources of iron; however, a significant fraction of the product was the perovskite YFeO3.
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Ball milling is a simple, fast, cost-effective green technology with enormous potential. One of the most interesting applications of this technology in the field of cellulose is the preparation and the chemical modification of cellulose nanocrystals and nanofibers. …
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All results show that YFeO3 synthesized by high-energy ball milling assisted with annealing possess a multiferroic behavior. ... The effect of Cr3+ doping on the YFeO3 structure and magnetic ...
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