Microwave resonant and zero-field absorption study of pure and doped ferrite nanoparticles

Kurlyandskaya, G.V.; Bhagat, S. M.; Jacobo, Silvia E.; Aphesteguy, Juan Carlos; Schegoleva, N.N.

doi:10.1016/j.jpcs.2011.01.002

Cited by 22 publications

(36 citation statements)

References 21 publications

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“…It has been shown in many previous studies that M s of the iron oxide nanoparticles can be significantly smaller (about 30% short fall) compared to corresponding bulk values showing clear tendency: the smaller the particles the lower the value of the saturation magnetization. 6,13,21,22 Therefore, the much lower values of M s (compared to corresponding bulk magnetite numbers) which were found for SB, and especially SA EEW MPs, are not surprising. The widely accepted explanation of a decrease in saturation magnetization as the average particle size is reduced due to the existence of surface spin disorder 22 of the studied types.…”

Section: Resultsmentioning

confidence: 90%

“…2) is quite typical for MNPs of the iron oxides. 13 This can be explained in part by the non-symmetrical shape of the very narrow peak of a high intensity. Although neither XRD following a standard procedure nor TEM confirming the presence of additional phases, like iron, we supposed that the observed mismatch must be a consequence of the presence of the residual metallic iron in some of the nanoparticles due to the features of the fabrication technique.…”

Section: Resultsmentioning

confidence: 99%

“…Such a structure is sometimes called a "defective" spinel. 13,20 Let us analyze the saturation magnetization values. It has been shown in many previous studies that M s of the iron oxide nanoparticles can be significantly smaller (about 30% short fall) compared to corresponding bulk values showing clear tendency: the smaller the particles the lower the value of the saturation magnetization.…”

Section: Resultsmentioning

confidence: 99%

“…6,[17][18][19] Since the FMR lines are broad (as in all previous cases for MNPs) 13,18,19 it is not advisable to use the modulation technique. We would rather measure the microwave absorption (P) itself as a function of the applied field.…”

Section: Methodsmentioning

confidence: 98%

“…In addition, for the sake of the discussion below and for direct comparison of the microwave behavior of non-spherical and spherical iron oxide MNPs obtained by different techniques (see Tables I and II), we have also included data on MNPs obtained by wet chemical techniques: coprecipitation (SC-sample) and doped ferrite fabricated by the sol-gel autocombustion method (SD sample) 13 respectively (Table I). SC and SD MNPs with a different level of deviation of their shapes from spherical ones were previously studied using the standard microwave technique and the traditional way of preparing the samples for microwave studies.…”

Section: Methodsmentioning

confidence: 99%

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Spherical magnetic nanoparticles fabricated by electric explosion of wire

et al. 2011

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We report the first use of an electrophysical method of electric explosion of wire for preparing magnetic nanoparticles of iron oxide. X-ray diffraction, transmission electron microscopy, magnetization and magnetic resonance measurements were comparatively analyzed. They indicated that the shape of magnetic nanoparticles is close to being spherical. The production order of 100g per hour by this method is advantageous when a large amount of material is needed for applications

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Spherical magnetic nanoparticles fabricated by electric explosion of wire

et al. 2011

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Influence of samarium doping on structural, thermoelectrical properties of nanocrystalline cobalt ferrite

Boda,

Puli,

Siddeshwar

et al. 2024

J Mater Sci: Mater Electron

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Samarium substituted Cobalt ferrite nanoparticles with chemical formula CoSm X Fe 2-X O 4 (where X=0.0, 0.010, 0.030, 0.050, 0.070 0.090 and 0.10) were synthesized via citrate-gel auto combustion method.Followed by annealing at 500 °C for 4 h in air. The physical properties of the sample were detected through x-ray diffraction, Fourier transformation infrared spectroscopy transmission electron microscopy, scanning electron microscopy, thermo electric power measurements, and dielectric measurement techniques. X-ray diffraction (XRD) analysis showed single-phase cubic spinel structure of the ferrites and the values of lattice constant (a) and x-ray density (d x ) increased with the increase of Sm 3+ content.The surface morphology of the samples was observed by scanning electron microscopy (SEM). Thermoelectric power studies of prepared samples were carried out from room temperature to well beyond Transition temperature (K) with a differential method. The seebeck coe cient variation with temperature was studied and it shows the prepared samples are n-type semiconducting nature. The transition temperatures of the prepared samples were also observed from thermoelectric power studies measurements. The dielectric parameters like real part of dielectric constant(ε ), imaginary part dielectric constant (ε ), Loss tangent(Tanδ), AC Conductivity, of the samples were studied as a function of frequency in the range of 50Hz to5MHz at room temperature using Agilent E4980 were studied. The observed result can be explained on the basis of conduction mechanism. HighlightsCitrate Gel Auto Combustion technique is a convenient way for obtaining a homogeneous nano sized mixed ferrites, it is very simple and economical method where no speci c heating or cooling rate is required.The crystalline size of the various Co-Sm ferrites was in the range of 14 to26 nm.Seebeck coe cient of the prepared Co-Sm ferrite samples were increased with increase in temperature. Curie temperature of the samples was observed to be decreased with increasing Sm concentration in the Co-Sm nano crystalline ferrite, Beyond the curie temperature seebeck coe cient start decreases by increases the high temperature the AC conductivity of the prepared samples increases slowly at lower frequency, but after certain frequency it increases rapidly.The Co-Sm nano ferrites loss tangent decreased with increase in frequency for each sample

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Oxidation of Sulfides with H2O2 Catalyzed by Impregnated Graphene Oxide with Co–Cu–Zn Doped Fe3O4/Co3O4–MoO3 Nanocomposite in Acetonitrile

Khoshroo

Hosseini‐Monfared

2016

J Inorg Organomet Polym

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Microwave resonant and zero-field absorption study of pure and doped ferrite nanoparticles

Cited by 22 publications

References 21 publications

Spherical magnetic nanoparticles fabricated by electric explosion of wire

Spherical magnetic nanoparticles fabricated by electric explosion of wire

Influence of samarium doping on structural, thermoelectrical properties of nanocrystalline cobalt ferrite

Oxidation of Sulfides with H2O2 Catalyzed by Impregnated Graphene Oxide with Co–Cu–Zn Doped Fe3O4/Co3O4–MoO3 Nanocomposite in Acetonitrile

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