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  • Nickel‐cobalt‐zinc ferrite nanoparticles for radio

    2.3 Mechanical milling of Ni 0.5 Co 0.2 Zn 0.3 Fe 2 O 4 powder Then, the obtained powder is mechanically milled using a planetary ball mill (Fritsch Pulverisette 6) carried out at 300 rpm for 72 h. In this milling technique, the ferrite powder and zirconia grinding balls (5 and 3 mm in diameter) are used with an approximate ratio by weight of 1:3. Acetone is used as a wet medium to enhance the

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  • (PDF) Ballmilling of FeC (20–75% Fe) | A. Calka

    In addition, Yelsukov et al (6) have prepared Fe3C by milling Fe powder in the presence of liquid hydrocarbon. Concurrent with the above investigations (3,4,1) which have been carried out mainly in the presence of an argon or nitrogen atmosphere using graphite powder, we have studied FeC powder mixtures using activated carbon and vacuum milling. EXPERIMENTAL The starting materials were Fe

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  • Characterisation of Mn Zn0.37Fe2O4 Powders After Intensive

    optimal extent of milling and heating proportions and thus to the desired composition and structure. 2. Experimental Commercial MnZn ferrite powder (composition Mn0.63Zn0.37Fe2O4, 93 wt.% and Fe2O3 7 wt.%) was milled in a planetary ball mill for 30, 60, 120 and 240 minutes. The

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  • Comparison of the Characteristics of Nanocrystalline

    Nanocrystalline ferrite formation by ball milling in Fe–0.89C steelswith initial pearlite and spheroidite microstructures and their annealing behaviors have been studied through microstructural observation and microhardness measurement. It was found that nanocrystalline ferrite first forms near the surface of powders due to localized severe deformation. The microhardness of nanocrystalline

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  • The structure of nitrogensupersaturated ferrite produced

    Highly supersaturated solid solutions of nitrogen in ferrite (bcc) were produced by ball milling of various powder mixtures of &iron and (Fe3N1.08. The microstructure and the crystal structure of the product phases were examined as function of nitrogen content using Xray powder diffraction,

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  • Mechanosynthesis of nanostructured magnetic .

    25.07.· Nanocrystalline Ni–Zn ferrite (NiZnFe 2 O 4) was directly produced by high energy ball milling of stoichiometric mixture of ZnO, NiO, Fe 2 O 3 powders. The crystallite size of NiZnFe 2 O 4 after 60 h ball milling was estimated to be 18 nm which increased to 45 nm after annealing at 800 °C for 4 h. After annealing the saturation magnetization was increased and coercivity was decreased as

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  • Magnetization and magnetocaloric effect in ball .

    25/01/· Magnetization and magnetocaloric effect in ballmilled zinc ferrite powder Journal of Applied Here we report the first investigation of MCE properties in ballmilled Zn Fe 2 O 4 particles. The MCE was obtained by measuring a family of MH curves at set temperature intervals and calculating the entropy change (Δ S) for this system using the Maxwell relation. The surface structure of zinc

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  • "Lowtemperature sintering of Ztype hexagonal ferrite by

    sieve and subsequently, pulverized by ballmilling in ethanol using a zirconia jar and balls. The average particle size of the resulting additive glass powder was ~0.52 µm. The ferrite was prepared by the traditional solidstate reaction method. The reagents of BaCO3, CoO, and Fe2O3 were mixed in the ratio corresponding to the stoichiometric Co2Z (Ba3Co2Fe24O41) by ballmilling for 8 h. The

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  • Microstructure and electromagnetic properties of .

    15.05.· The effect of dry and wet ball milling of LiFe 5 O 8 ferrite powder on the microstructure and electromagnetic properties of ferrite ceramics was studied using XRD analysis, scanning electron microscopy, dilatometry, thermogravimetry, calorimetry, and measurement of specific magnetization and electrical resistance. The sintering temperature was °C; the sintering time was 2 h.

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  • Nickel‐cobalt‐zinc ferrite nanoparticles for radio

    2.3 Mechanical milling of Ni 0.5 Co 0.2 Zn 0.3 Fe 2 O 4 powder Then, the obtained powder is mechanically milled using a planetary ball mill (Fritsch Pulverisette 6) carried out at 300 rpm for 72 h. In this milling technique, the ferrite powder and zirconia grinding balls (5 and 3 mm in diameter) are used with an approximate ratio by weight of 1

    Get Price
  • Magnetization and magnetocaloric effect in ball .

    25/01/· Magnetization and magnetocaloric effect in ballmilled zinc ferrite powder Journal of Applied Here we report the first investigation of MCE properties in ballmilled Zn Fe 2 O 4 particles. The MCE was obtained by measuring a family of MH curves at set temperature intervals and calculating the entropy change (Δ S) for this system using the Maxwell relation. The surface structure of zinc

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  • The structure of nitrogensupersaturated ferrite .

    Highly supersaturated solid solutions of nitrogen in ferrite (bcc) were produced by ball milling of various powder mixtures of αiron and εFe 3 N 1.08.The microstructure and the crystal structure of the product phases were examined as a function of nitrogen content using Xray powder diffraction, highresolution electron microscopy and Möss spectroscopy.

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  • Influence of Milling Time on Structural and

    solid state reaction route using the planetary ball milling technique in dry method. The powder of Co 2O3, MnO 2 and Fe 2O3 were mixed in desired proportionate (nonstoichiometric ratio) and hand milled for 2 hours before calcination. After calcination at 550 0C, again the mixer was ball milled for 8h and 12h for analyzing the effect of

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  • Comparison of the Characteristics of .

    06.09.· Nanocrystalline ferrite formation by ball milling in Fe–0.89C steels with initial pearlite and spheroidite microstructures and their annealing behaviors have been studied through microstructural observation and microhardness measurement. It was found that nanocrystalline ferrite first forms near the surface of powders due to localized severe deformation. The microhardness of nanocrystalline

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  • Effect of particle size of asmilled powders on

    Yttrium iron garnet ferrite using the chosen stoichiometry of (Y 3)(Mn x Al 0.8x Fe 4.2)O 12 with x = 0.1 and different milling powder sizes were prepared through ball milling for various milling times to study the effect of powder size reduction on the resulting microstructural and magnetic properties. Sintered yttrium iron garnet ferrites were characterized by Xray diffraction analysis and

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  • Synthesis of .

    Phases, microstructure and magnetic properties of the ferrites prepared by different processes were investigated. The (Mg 0.476 Mn 0.448 Zn 0.007 )(Fe 1.997 Ti 0.002 )O 4 nanocrystalline powder could be prepared by high energy ballmilling process of raw Fe 3 O 4, MnO 2, ZnO, TiO 2 and MgO powders.

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  • Effect of particle size of as‐milled powders on

    15.11.· Yttrium iron garnet ferrite using the chosen stoichiometry of (Y 3)(Mn x Al 0.8x Fe 4.2)O 12 with x = 0.1 and different milling powder sizes were prepared through ball milling for various milling times to study the effect of powder size reduction on the resulting microstructural and magnetic properties. Sintered yttrium iron garnet ferrites were characterized by Xray diffraction analysis and

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  • Comparison of the Characteristics of .

    06.09.· Nanocrystalline ferrite formation by ball milling in Fe–0.89C steels with initial pearlite and spheroidite microstructures and their annealing behaviors have been studied through microstructural observation and microhardness measurement. It was found that nanocrystalline ferrite first forms near the surface of powders due to

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  • Structure and magnetic properties of ballmill .

    05.03.· Ni–Zn ferrite powders with chemical formula Ni 0.64 Zn 0.36 Fe 2 O 4 were prepared by high energy ball milling. NiO, ZnO and Fe 2 O 3 powders were used as raw materials. Chemical composition and average particle size of the initial powders are listed in Table 1.

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  • Effect of particle size of asmilled powders on

    Yttrium iron garnet ferrite using the chosen stoichiometry of (Y 3)(Mn x Al 0.8x Fe 4.2)O 12 with x = 0.1 and different milling powder sizes were prepared through ball milling for various milling times to study the effect of powder size reduction on the resulting microstructural and magnetic properties. Sintered yttrium iron garnet ferrites were characterized by Xray diffraction analysis and

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  • Synthesis of Ferrite Nanoparticles by .

    Ferrites with the spinel structure have a wide field of technological applications. In the present study, various ferrite (Fe 3 O 4, CoFe 2 O 4 and Ni 0.5 Zn 0.5 Fe 2 O 4) nanoparticles were synthesized by mechanochemical reaction in aqueous solution of various chlorides (FeCl 3, CoCl 2 or NiCl 2 /ZnCl 2) and NaOH in a horizontal ball mill.Structures, morphologies, compositions and magnetic

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  • "Lowtemperature sintering of Ztype hexagonal ferrite by

    sieve and subsequently, pulverized by ballmilling in ethanol using a zirconia jar and balls. The average particle size of the resulting additive glass powder was ~0.52 µm. The ferrite was prepared by the traditional solidstate reaction method. The reagents of BaCO3, CoO, and Fe2O3 were mixed in the ratio corresponding to the stoichiometric Co2Z (Ba3Co2Fe24O41) by ballmilling for 8 h. The

    Get Price
  • Sintering effect on structural, magnetic and .

    Ni 0.5 Zn 0.5 Fe 2 O 4 nano ferrite particles have been prepared by mechanical alloying via high energy ball milling and sintered at different temperatures from 700 °C to °C. Spinel structure is confirmed from the analysis of XRD data. Rietveld refinement method is employed to refine the XRD powder data and the structural parameters are calculated from the refinement.

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  • Magnetic properties of Baferrite powders .

    01.03.· OSTI.GOV Journal Article: Magnetic properties of Baferrite powders prepared by surfactant assisted ball milling

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  • Effect of particle size of as‐milled powders on

    15.11.· Yttrium iron garnet ferrite using the chosen stoichiometry of (Y 3)(Mn x Al 0.8x Fe 4.2)O 12 with x = 0.1 and different milling powder sizes were prepared through ball milling for various milling times to study the effect of powder size reduction on the resulting microstructural and magnetic properties. Sintered yttrium iron garnet ferrites were characterized by Xray diffraction analysis and

    Get Price
  • Effect of particle size of as‐milled powders on

    15.11.· Yttrium iron garnet ferrite using the chosen stoichiometry of (Y 3)(Mn x Al 0.8x Fe 4.2)O 12 with x = 0.1 and different milling powder sizes were prepared through ball milling for various milling times to study the effect of powder size reduction on the resulting microstructural and magnetic properties. Sintered yttrium iron garnet ferrites were characterized by Xray diffraction analysis and

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  • Effect of milling conditions on the formation of ZnFe2O4

    Powder mixtures of ZnO and Fe 2 O 3 were milled in high energy vibrant ball milling for different balls to powders mass ratio and milling times. Xray diffraction and scanning electron microscopy are used to characterize the powders. A crystalline size and lattice parameter are obtained from Scherrer formula and the Nelson–Riley function respectively. It was found that the balls to powder

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  • Nanocrystallization in Fe–C Alloys by Ball Milling and

    tive atmosphere with a weight ratio of ball to powder of 100:1. In the ball drop test, the bulk specimens (thickness: several mm, diameter: f15mm) of Fe–0.89C (Fe–0.89C– 0.25Si–0.50Mn in mass%, pearlite and spheroidite) and Fe–0.15C (Fe–0.15C–0.35Si–1.24Mn in mass%, ferrite cementite) were used. Fe–0.15C specimen with grain size about 1mm was produced by heavy rolling (K

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  • Fine Iron Oxide Powder as a Raw Material of Soft Ferrites

    to obtain finer ferrite particles in a short ballmilling time, iron oxide (hematite, αFe2O3), calcined powders were ballmilled for 2 h, then 0.5% of polyvinyl alcohol was added to the milled powder. The size and shape of individual powder particles were observed by SEM. The mixed powders with 0.5% of polyvinyl alcohol were pressed into troidal shape (19 mm in outer diameter, 10 mm in

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  • Zinc Ferrite Powder Synthesized by High .

    The nanocrystalline zinc ferrite (ZnFe2O4) powder was synthesized by high energy reactive ball milling (RM) in a planetary mill. As starting materials a mixture of commercial zinc oxide (ZnO) powder and iron oxide (Fe2O3) powder was used. The starting mixture was milled for different periods of time, up to 30 h. The milled powders were annealed for 4 h at 350 oC in order to eliminate the

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  • A comparative study of different concentrations .

    In this study, a powder mixture of Zn, Fe 2 O 3 and NiO was used to produce different compositions of Ni 1x Zn x Fe 2 O 4 (x=0.36, 0.5 and 0.64) nanopowders. Highenergy ball milling with a subsequent heat treatment method was carried out. The XRD results indicated that for the content of Zn, x=0.64 a single phase of NiZn ferrite was produced after 30 h milling while for the contents of Zn

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  • Effect of HighEnergy Ball Milling on the Magnetic

    0.5Fe 2O 4 ferrite ceramics were synthesized by spark plasma sintering (SPS) in conjunction with high energy ball milling. The precursor powders milled for were 20 h, 40 h, and 60 h, respectively, and the milled powders were all sintered for 5 min at 900˚C. All

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