Crystalline anisotropy and cation distribution in nanosized quasi-spherical ferroxide particles

Nedkov, I.; Kolev, Svetoslav; Zadro, K; Krezhov, K.; Merodiiska, T.

doi:10.1016/j.jmmm.2003.12.225

Cited by 12 publications

(6 citation statements)

References 6 publications

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“…The relative areas (RA) of Fe on the different sites do not correspond fully to the standard values (50 : 16.6 : 16.6 : 8.3 : 8.3 [23]). A similar distribution has been also observed in powder samples of mono-domain barium hexaferrite powders produced by co-precipitation [22,24]. The bipyramidal (2b) sites are not fully occupied.…”

Section: Resultssupporting

confidence: 75%

Structural and Magnetic Properties of Nanosized Barium Hexaferrite Powders Obtained by Microemulsion Technique

Koutzarova

Kolev

Grigorov

et al. 2010

SSP

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Abstract. Thin hexagonal barium hexaferrite particles synthesized using the microemulsion technique were studied. A water-in-oil reverse microemulsion system with cetyltrimethylammonium bromide (CTAB) as a cationic surfactant, n-butanol as a co-surfactant, n-hexanol as a continuous oil phase, and an aqueous phase were used. The microstructural and magnetic properties were investigated. The particles obtained were mono-domain with average particle size 280 nm. The magnetic properties of the powder were investigated at 4.2 K and at room temperature. The saturation magnetization was 48.86 emu/g and the coercivity, 2.4 x 10 5 A/m at room temperature. The anisotropy field H a and magneto-crystalline anisotropy K 1 were 1.4 x 10 6 A/m and 2.37 x 10 5 J/m 3 , respectively.

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Section: Resultssupporting

confidence: 75%

Structural and Magnetic Properties of Nanosized Barium Hexaferrite Powders Obtained by Microemulsion Technique

Koutzarova

Kolev

Grigorov

et al. 2010

SSP

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“…It can be seen that all the characteristic peaks of the three samples are well-coincided with respect to the standard peaks. There is no other undesired diffraction maximums of the impurities that can be observed from the spectra and the asproduced magnetite samples are found to exist in inverse cubic spinel structure [41]. Interestingly, it is noted that the spectrum for sample SCM2 (silica coated magnetic nanoclusters with pre-determined reaction parameters) consisted of amorphous structure in between the range of 208 and 308 2u region which is attributed to the amorphous silica matrix, as being clearly indicated in Fig.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 61%

Morphological studies of randomized dispersion magnetite nanoclusters coated with silica

Haw

Chia²,

Zakaria

et al. 2011

Ceramics International

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“…Maity and Agrawal, however, report that the aggregation of the Fe 3 O 4 nanoparticles is essentially due to magnetostatic interaction as a result of the dipole-dipole interaction [10]. [21]. The result also reveals the superparamagnetic behaviour of the produced Fe 3 O 4 nanoparticles due to its relatively low remanence magnetization and the coercivity.…”

Section: Resultsmentioning

confidence: 91%

Hydrothermal synthesis of magnetite nanoparticles as MRI contrast agents

Haw

Mohamed

Chia

et al. 2010

Ceramics International

150

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Magnetite (Fe 3 O 4 ) nanoparticles prepared using hydrothermal approach were employed to study their potential application as magnetic resonance imaging (MRI) contrast agent. The hydrothermal process involves precursors FeCl 2 Á4H 2 O and FeCl 3 with NaOH as reducing agent to initiate the precipitation of Fe 3 O 4 , followed by hydrothermal treatment to produce nano-sized Fe 3 O 4 . Chitosan (CTS) was coated onto the surface of the as-prepared Fe 3 O 4 nanoparticles to enhance its stability and biocompatible properties. The size distribution of the obtained Fe 3 O 4 nanoparticles was examined using transmission electron microscopy (TEM). The cubic inverse spinel structure of Fe 3 O 4 nanoparticles was confirmed by X-ray diffraction technique (XRD). Fourier transform infrared (FTIR) spectrum indicated the presence of the chitosan on the surface of the Fe 3 O 4 nanoparticles. The superparamagnetic behaviour of the produced Fe 3 O 4 nanoparticles at room temperature was elucidated using a vibrating sample magnetometer (VSM). From the result of custom made phantom study of magnetic resonance (MR) imaging, coated Fe 3 O 4 nanoparticles have been proved to be a promising contrast enhanced agent in MR imaging. #

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Crystalline anisotropy and cation distribution in nanosized quasi-spherical ferroxide particles

Cited by 12 publications

References 6 publications

Structural and Magnetic Properties of Nanosized Barium Hexaferrite Powders Obtained by Microemulsion Technique

Structural and Magnetic Properties of Nanosized Barium Hexaferrite Powders Obtained by Microemulsion Technique

Morphological studies of randomized dispersion magnetite nanoclusters coated with silica

Hydrothermal synthesis of magnetite nanoparticles as MRI contrast agents

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