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A M#246;ss effect study of barium ferrite ballmilled in air Campbell, S. J.; Wu, E.; Kaczmarek, W. A.; Jayasuriya, K. D. Abstract. The effects of drymilling BaFe 12 O 19 in air for periods of 190, 360, 590, 690 and 1000 h have been investigated by Xray diffraction and M#246;ss
In this research a mixture of barium ferrite and graphite powders was milled in a planetary ball mill and then heat treated in vacuum to produce BaFe{sub 12}O{sub 19}/Fe{sub 3}O{sub 4} and Fe/Fe{sub 3}O{sub 4} magnetic nanocomposites.
The structural and magnetic behaviour of BaFe 12 O 19 subjected to milling in vacuum for 1000 h has been investigated by xray powder diffraction and M#246;ss effect spectroscopy techniques. Pronounced structural disorder is obtained along with partial decomposition of BaFe 12 O 19 to Fe 2 O 3lt;/SUBgt; and evidence for superparamagnetic relaxation effects due to the fine particles produced
A mixture of barium ferrite, BaO#183;6(Fe2O3) (SigmaAldrich, particle size 44 #181;m) and graphite (SigmaAldrich, particle size 20 #181;m) was treated mechanochemically in a high energy planetary ball mill for 10, 15, 20 and 40 hours under air and argon atmosphere. Ball to powder mass ratio and rotating speed were 35 and 300 rpm, respectively.
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During roomtemperature ball milling in aqueous dispersions a process of fast decomposition can be observed. For a cationic surfactant at pH 10 the milling terminates in BaCO 3 and magnetite Fe 3 O 4 as main phases and the material remains magnetic. In the case of anionic surfactant type and the same pH value, the barium ferrite structure remains as the main phase, because surfactants do not
Barium Ferrite Ball Milled In Surfactant. Magnetic properties of barium ferrite after milling by . barium ferrite BaFe 12 O 19 still there are hematite Fe 2 O 3 and magnetite Fe 3 O 4 that unfinished reacted with barium carbonate BaCO 3. For the sample milled 120 minutes the formation of barium ferrite compound is better.
Feb 01, 1995#0183;#32;In the case of anionic surfactant type and the same pH value, the barium ferrite structure remains as the main phase, because surfactants do not absorb onto the oxide surface. On the basis of adsorption driven by electrostatic interactions it was possible to explain the effects of different surfactants on the milling product in dispersions with a low pH value.
Dec 01, 1994#0183;#32;The effects of drymilling BaFe12O19 in air for periods of 190, 360, 590, 690 and 1000 h have been investigated by Xray diffraction and M#246;ss effect measurements. The sizes of the BaFe12O19 particles decrease on milling, as expected, although a partial decomposition of BaFe12O19 to Fe2O3 is found to take place on extended milling (1000 h). The room temperature M#246;ss
Moreover, high energy ball milling is sometimes discussed as a means of mechanochemical synthesis: 42, 46, 47 Oleic acid can in general be used as a surfactant. However, in milled dispersions of
Barium ferrite, abbreviated BaFe, BaM, is the chemical compound with the formula BaFe 12 O and related ferrite materials are components in magnetic stripe cards and loudspeaker magnets. BaFe is described as Ba 2+ (Fe 3+) 12 (O 2) Fe 3+ centers are ferromagnetically coupled. This area of technology is usually considered to be an application of the related fields of materials
Mar 15, 2000#0183;#32;, changes in the surface and bulk characteristics of the powder hematite and barium ferrite milled in the presence of surfactants have been investigated. The purpose of this work was to investigate the effect of surfactants (oleic acid) on the structure, phase composition and magnetic characteristics of powders, obtained by milling of pure iron
The effects of drymilling BaFe12O19 in air for periods of 190, 360, 590, 690 and 1000 h have been investigated by Xray diffraction and M#246;ss effect measurements. The sizes of the BaFe12O19 particles decrease on milling, as expected, although a partial decomposition of BaFe12O19 to Fe2O3 is found to take place on extended milling (1000 h).
To test these interpretations, the Moess absorption spectra and angular variation of coercive force for ballmilled powders were determined. Surfactantassisted ball milling of BaFe12O19 ferrite dispersion, Materials K. D. Jayasuriya, A M#246;ss effect study of barium ferrite ballmilled in air, Hyperfine Interactions,
An anisotropic hexagonal barium ferrite sintered magnet is prepared by molding a powder barium ferrite raw material in a magnetic field into a compact and sintering the compact; or by molding a powder barium ferrite raw material in a magnetic field into a compact, disintegrating the compact into particles, compacting the particles in a magnetic field into a second compact, and sintering the
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The structural and stoichiometric changes which occur on milling barium ferrite, BaFe12O19, powder in vacuum and air for up to 1000 h have been investigated by Xray diffraction and Moss
Abstract. The structural and magnetic behaviour of BaFe 12 O 19 subjected to milling in vacuum for 1000 h has been investigated by xray powder diffraction and M#246;ss effect spectroscopy techniques. Pronounced structural disorder is obtained along with partial decomposition of BaFe 12 O 19 to Fe 2 O 3 and evidence for superparamagnetic relaxation effects due to the fine particles
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