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one-step synthesis of nickel ferrite nanoparticles by

one-step synthesis of nickel ferrite nanoparticles by

2012-4-1 · In this present paper, using NiCO 3 ⋅ 2Ni(OH) 2 ⋅ 4H 2 O as raw material and small iron milling balls (ϕ = 1.0–1.5 mm) as the supply of Fe source, well-ordered ellipsoidal nickel ferrite particles were directly synthesized at low temperature of ≤ 100 °C in 20 h, without the need of calcination, via ultrasonic-assisted solid–liquid reaction ball milling technique

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high coercivity induced by mechanical milling in cobalt

high coercivity induced by mechanical milling in cobalt

2013-10-1 · In this work we report a study of the magnetic behavior of ferrimagnetic oxide CoFe 2 O 4 treated by mechanical milling with different grinding balls. The cobalt ferrite nanoparticles were prepared using a simple hydrothermal method and annealed at 500 °C.The non-milled sample presented coercivity of about 1.9 kOe, saturation magnetization of 69.5 emu/g, and a remanence ratio of

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nickel‐cobalt‐zinc ferrite nanoparticles for radio

nickel‐cobalt‐zinc ferrite nanoparticles for radio

2021-2-22 · 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

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a low temperature synthesis of mnfe2o4 nanocrystals by

a low temperature synthesis of mnfe2o4 nanocrystals by

2013-1-15 · The MnFe 2 O 4 nanocrystals prepared by microwave-assisted ball-milling for 60 h using MnO 2 and Fe powder as the raw materials were characterized by TEM and SAED and examples were shown in Fig. 5. It is observed that the average diameter of the nanocrystals was about 20 nm. The well-dispersed nanocrystals were sphere-like particles

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mini-review: ferrite nanoparticles in the catalysis

mini-review: ferrite nanoparticles in the catalysis

2019-11-1 · 3. Nickel ferrites. Pure or doped nickel ferrites out of the nano-range size are common and frequently used in several catalytic processes. For instance, high reactivity of NiFe 2 O 4 (1 1 1) surfaces (higher that in Fe 3 O 4) is well-known; NiFe 2 O 4 is an effective metal-doped ferrite catalyst in a typical industrial process such as the water–gas shift (WGS) reaction (Kumar et al., 2013)

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effect of preparation methods on magnetic properties of

effect of preparation methods on magnetic properties of

2020-12-30 · As zinc ferrite obtained by the ceramic and sol-gel methods can present some residual amount of amount of ZnO and/or α-Fe 2 O 3, a portion of the powder obtained by these methods was mechanically milled to get complete homogeneity. For this goal, the powder was placed in stainless steel vial with 10:1 ball to powder weight ratio keeping

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spectroscopy investigation of nanostructured nickel–zinc

spectroscopy investigation of nanostructured nickel–zinc

2015-3-1 · Before milling, the Fe(OH) 3 × nH 2 O powder was heated at 105 °C for 24 h. The material prepared in this way had 99.5% Fe(OH) 3. It was confirmed by potentiometric redox titration. Mechanochemical synthesis was performed in air atmosphere in planetary ball mill Fritsch Pulverisette 5. Balls-to-powder mass ratio was 20:1

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magnetic investigation of various nife2−x bi x o4 ferrite

magnetic investigation of various nife2−x bi x o4 ferrite

2015-7-10 · The number and size of the balls were chosen so that a ball to powder ratio of 20 was achieved. In order to maintain an equal powder to ball mass ratio during all experiments, the vial was cleaned and reloaded exactly with 20 g of NiO, Fe 2 O 3 and Bi 2

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(pdf) influence of starting powder milling on magnetic

(pdf) influence of starting powder milling on magnetic

cess Fe 2 O 3 (it is denoted a s MZ-0). This powder was ... The ferrite powders were prepared by high energy ball-milling, and subsequently compacted under a pressure of 490MPa for 3min and

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fe-fes 2 adsorbent prepared with iron powder and pyrite by

fe-fes 2 adsorbent prepared with iron powder and pyrite by

Arsenic is one of the major pollutants and a worldwide concern because of its toxicity and chronic effects on human health. An adsorbent of Fe-FeS 2 mixture for effective arsenic removal was successfully prepared by mechanical ball milling. The products before and after arsenic adsorption were characterized with scanning electron microscopy, X-ray diffraction, Fourier transform infrared

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phase development during high-energy ball-milling of zinc

phase development during high-energy ball-milling of zinc

High-energy ball-milling of powder mixtures of zincite (ZnO) and iron (α-Fe) at different weight ratios was performed in air using a planetary ball mill with a stainless steel milling assembly. Structural and microstructural changes during the ball-milling (up to 30 h) were monitored using X-ray powder

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synthesis of ferrite nanoparticles by mechanochemical

synthesis of ferrite nanoparticles by mechanochemical

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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(pdf) characterisation of mn0.63zn0.37fe2o4 powders after

(pdf) characterisation of mn0.63zn0.37fe2o4 powders after

PDF | Commercial Mn-Zn powder (Mn0.63Zn0.37Fe2O4, 93 wt. % and Fe2O3 7 wt. %) was milled 0.5, 1, 2 and 4 hours in a planetary ball mill. The goal was... | Find, read and cite all the research you

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ultra-low percolation threshold in ferrite-metal cofired

ultra-low percolation threshold in ferrite-metal cofired

2015-1-5 · After calcined at 760°C for 4 h, the obtained ferrite powders were mixed with spherical silver powder (1 μm, 99.9%) in ball mill. Then, the mixture was granulated using 5% polyvinyl alcohol

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