Novel Aluminium Based Composite Materials Exhibiting ...
2Department of Mechanical Engineering, College of Industrial Technology, Nihon University, 1-2-1 Izumi-cho, Narashino, Chiba, 275-8575 Japan Functionally aluminium based composite materials with exhibiting magnetic properties were fabricated using a mixture of pure aluminium and ferrite powder via mechanical alloying (MA) and
Mechanically induced structural disordering in spinel ferrites
Šepelák and Tkáčová: Mechanically induced structural disordering in spinel ferrites mechanical activation the spinel motif of the structure is retained (cubic symmetry with space group Fd3m does not disappear), it Fig.1. Rietveld refinement profile of the X-ray powder diffraction data for mechanically activated (5 min) zinc ferrite. Points ...
Study of the Radio-Wave Absorbing Properties of a Lithium ...
Results are presented of a study of the radio-wave absorbing properties of a composite material based on lithium-zinc ferrite with composition Li 0.4 Fe 2.4 Zn 0.2 O 4, synthesized by heating a mechanically activated mixture of the initial reagents Li 2 CO 3 –ZnO–Fe 2 O 3 in a high-energy electron beam. It has been shown that a composite based on this material is promising as a radio-wave ...
A temperature-dependent Möss study of mechanically ...
Attention is directed to mechanically induced changes in magnetic properties of zinc ferrite, the variation of nuclear quadrupolar interactions, the thermally induced changes of the Möss shift, and also to the structural response of mechanically activated zinc ferrite to changes in temperature.
Structure?Reactivity Study of Mechanically Activated Zinc ...
Abstract Changes in the structure and reactivity of zinc ferrite as a result of mechanical activation and thermal relaxation have been studied. The transition of zinc ferrite into a metastable state is the result of the mechanically induced inversion and the partial deformation of the anion sublattice.
Low temperature-fired Ni-Cu-Zn ferrite nanoparticles ...
Low temperature-fired Ni-Cu-Zn ferrite nanoparticles through auto-combustion method for multilayer chip inductor applications. ... Such aggregate formation and broader size distribution are characteristic of mechanically activated nanosized particles.
Hyperfine interactions in multiferroic mechanically ...
Hyperfine interactions in multiferroic mechanically activated ... Bismuth ferrite BiFeO3 (or BFO) is one of the most known multiferroics in which ferroelectric and antiferromagnetic ordering exist at room temperature. BiFeO3 is reported to have a rhombohedrally distorted
Investigation the influence of mechanically activated of ...
In this paper, the influence of mechanical activation of Li2CO3-Fe2O3 initial reagents on the nonisothermalsynthesis of LiFeO2 lithium ferrite was studied by TG/DSC methods. The mechanical activation wascarried out in AGO 2C planetary mill using steel vial and grinding balls for 60 minutes.
Effect of Zn Substitution on the Magnetic Properties of ...
Zinc substituted cobalt ferrite nanoparticles (CoxZn1-xFe2O4, with x = 0.0, 0.2, 0.4, 0.8 and 1.0) were prepared via sol-gel route and the effect of zinc concentration on saturation magnetization and lattice parameter were investigated. The particle sizes of the as obtained samples were found to be ~10 nm which increases upto ~92 nm on annealing at 1000oC.
Effect of BaTiO concentration ż of mechanically activated ...
Bismuth ferrite, BiFeO 3, is one of such multiferroic materials, in which ferroelectric-ity and antiferromagnetism coexist at room tempera-ture. The BiFeO 3 has a ferroelectric phase transition temperature, T C ~ 1100 K [3] and antiferromagnetic ... of mechanically activated BiFeO
The effects of mechanical activation in synthesizing ...
Well dispersed and fine barium ferrite (BaFe12O19) powders have been successfully prepared by mechanically activating co-precipitated precursors, followed by calcination at 700 and 800 °C. When mechanically activated in a sodium chloride matrix for 20 hours, nanocrystallites of BaFe12O19, α-Fe2O3 and a spinel (γ-Fe
Preparation of Strontium Ferrite Particles by Spray Pyrolysis
Preparation of Strontium Ferrite Particles by Spray Pyrolysis ... Hiroaki Matsushima and Toshimitsu Suzuki, Preparation of activated carbon-supported ferrite for absorbent of hydrogen ... Crossref. V. Berbenni and A. Marini, Solid state synthesis of strontium oxoferrates from the mechanically activated system SrCO3 –Fe2O3, ...
Effect of mechanical activation on the kinetics of ...
Effect of mechanical activation on the kinetics of extracting indium from indium-bearing zinc ferrite. ... The synthetic indium-bearing zinc ferrite (IBZF) was mechanically activated by a stirring ball mill and subsequently studied for the leaching behavior and kinetics of extracting indium from IBZF. The effect of the change in crystalline ...
Structure and Hyperfine Interactions of Mechanically ...
Delafossite CuFeO2 belongs to multiferroic class of materials. In this work, copper ferrite was prepared by mechanical activation with subsequent thermal treatment. X-ray diffraction and Möss spectroscopy were used as complementary methods to study the structure and hyperfine interactions of the material. As proved by X-ray diffraction, CuFeO2 compound was obtained with relatively low ...
Crystal Structure Refinement of the Mechanically Activated ...
V. Šepelák et al., "Crystal Structure Refinement of the Mechanically Activated Spinel-Ferrite", Materials Science Forum, Vols. 228-231, pp. 783-788, 1996
Surface Structure of Mechanically Activated and of ...
The changes in the surface structure of mechanically activated and of mechanosynthesized zinc ferrite as a function of the mechanical treatment time and the relaxation of the mechanically induced inverse spinel structure by thermal treatment in the temperature …
Structural and Magnetic Properties study of CoFe2O4 ...
ferrite phase at the expense of the reduction of those of α-Fe2O3 phase and the only major phase observed was CoFe2O4 for these samples, within the detection accuracy limit of XRD technique. Fig 1: XRD multiplot patterns of Co/Fe2O3 powder blend mechanically activated for 0 h (a), 1h (b), 5h (c), 15h (d), 25h (e) and 30h (f).
Thermal analysis study of LiFeO2 formation from Li2CO3 ...
Abstract. The solid-phase synthesis of LiFeO 2 lithium ferrite from mechanically activated Fe 2 O 3 –Li 2 CO 3 initial reagent mixtures was investigated by X-ray powder diffraction and thermal analysis techniques. The mechanical milling of powder mixture was carried out by AGO-2S planetary ball mill with a rotation speed of 2220 rpm for 60 min.
Large zinc cation occupancy of octahedral sites in ...
The cation site occupancy of a mechanically activated nanocrystalline zinc ferrite powder was determined as (Zn0.552+Fe0.183+)tet[Zr0.452+Fe1.823+]octO4 through analysis of extended x-ray absorption fine structure measurements, showing a large redistribution of cations between sites compared to normal zinc ferrite samples. The overpopulation of cations in the octahedral sites was …
Performance of activated TIG process in mild steel welds
Activated flux is used in the A-TIG welding, which is the only difference from the conventional TIG welding. Activated flux can be prepared by using different kind of component oxides packed in the powdered form with about 30-60 µm particle size. These powders mixed with acetone,methanol, ethanol etc to produce a paint-like consistency.
(PDF) Structural and magnetic properties of nanosize ...
In analogy with the mechanically activated NiFe2O4 (synthesized by the conventional method, followed by References high-energy milling), the magnetic properties of mechan- osynthesized NiFe2O4 are associated with both the & [1] V. Sepel!ak, in: M. Senna (Ed.), Preparation of Functional canted spin configuration [8] and the non-equilibrium ...
Thermal analysis study of solid-phase ... - SpringerLink
Abstract. The solid-phase synthesis of Li 0.4 Fe 2.4 Zn 0.2 O 4 and Li 0.6 Fe 2.2 Ti 0.2 O 4 lithium-substituted ferrites from mechanically activated Li 2 CO 3 –Fe 2 O 3 –ZnO and Li 2 CO 3 –TiO 2 –Fe 2 O 3 initial reagent mixtures was investigated using X-ray powder diffraction (XRD) and thermal analysis (TG/DSC) techniques. The mechanical milling of powder mixtures was carried out by ...
Effects of Lithium and Oxygen Losses on Magnetic and ...
The products formed on rapid cooling are equivalent to solid solutions of spinel lithium ferrite with Fe 3 O 4, ... Thermal analysis study of solid-phase synthesis of zinc- and titanium-substituted lithium ferrites from mechanically activated reagents, Journal of Thermal Analysis and Calorimetry, 122, 3, (1347), (2015). Crossref. Victory ...
SURFACE STRUCTURAL DISORDER IN …
SURFACE STRUCTURAL DISORDER IN MECHANOSYNTHESIZED AND MECHANICALLY ACTIVATED ZINC FERRITE Vladimír Šepelák1, Peter Druska2 and Ursula Steinike2 1Institute of Geotechnics of the Slovak Academy of Sciences, Watsonova 45, 04353 Košice, Slovak Republic, E-mail: [email protected] or [email protected]
Vincent G. Harris - Publications
(Appearing also under peer-reviewed publications) ... “ Ferrite Film Growth on Semiconductor Substrates Towards Microwave and Millimeter Wave Integrated Circuits,” J. Appl. Phys, ... “Large zinc cation occupancy of octahedral sites in mechanically activated zinc ferrite …
THERMIC STABILITY AND REACTIVITY OF MECHANICALLY …
THERMIC STABILITY AND REACTIVITY OF MECHANICALLY-ACTIVATED ZINC FERRITE . By Vladimir Nikolaevich Shepelyak. Abstract. It has been shown that as a result of the machining both the re-distribution of the cations and the deformation of anion sublattice take place. At thermic treatment of the mechanically activated specimens there is the partial ...
Electrical Conductivity, Magnetoconductivity and ...
Oct 04, 2010· We report a comprehensive study of electrical transport properties of stoichiometric (Mg,Ni)-ferrite in the temperature range 77 ≤ T ≤ 300K, applying magnetic field upto 1T in the frequency range 20 Hz-1 MHz. After ball milling of MgO, NiO and ?-Fe2O3 and annealing at 1473K, a (Mg,Ni)-ferrite phase is obtained. The temperature dependency of dc resistivity indicates the prevalence of a ...
Structure–Reactivity Study of Mechanically Activated Zinc ...
An interesting observation is that in the spectra of both mechanosynthesized and mechanically activated zinc ferrites, the newly created component of the Zn 2p 3/2 signal has the same peak ...
Mechanical Activation (MA) - scientific.net
The main conclusion based on analysis is that mechanical activation enables better compaction of activated powders, i.e. possibility of achieving higher densities of green bodies without binders, but first of all that Zn2TiO4 ceramics can be obtained by mechanical activation after a certain time with appropriate thermal treatment, i.e. heating ...
Rietveld Analysis of Mechanically Activated Powdered Zinc ...
Request PDF on ResearchGate | Rietveld Analysis of Mechanically Activated Powdered Zinc Ferrite | The mechanically induced changes in structure and magnetic properties of zinc ferrite were ...
Mechanothermal Solid-state Synthesis of Cobalt(II) Ferrite ...
Cobalt ferrite (CoFe2O4) has been synthesized by a solid-state mechanothermal process, and its molar heat capacity has been determined. A stoichiometric mixture of CoC2O4 ·2H2Oand FeC2O4 ·2H2O was subjected to a combination of mechanical activation (by high-energy milling) and thermal activation (by annealing at temperatures between 300 and ...
Bismuth Ferrite Research Papers - Academia.edu
The properties of multiferroic BiFeO3 nanoparticles with core-shell structure produced by mechanically activated room temperature synthesis were studies by electron spin resonance spectroscopy and X …
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