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Berdonosov, S. S.; Мелихов, И. В.; Baronov, S. B.; Kuz'micheva, Yu. V.; Berdonosova, D. G.

doi:10.1023/a:1014727122955

Doklady Chemistry

2002

DOI: 10.1023/a:1014727122955

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S. S. Berdonosov

И. В. Мелихов

S. B. Baronov

et al.

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Cited by 3 publications

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“…Furthermore, oxides have the capacity to absorb microwave radiation, thereby undergoing rapid heating [8]. Thus, microwave irradiation also may facilitate better crystallization of the ferrites, which would improve their magnetic properties.…”

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confidence: 99%

Effect of formation conditions on the structure, morphology and magnetic properties of nanosized MIIFe 2 III O4 ferrites (M = Mn, Co, Ni) and Fe2O3

et al. 2007

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A study was carried out on the conditions of formation of highly crystalline, superparamagnetic, nanosized oxides, M Fe II 2 III O 4 and g-Fe 2 O 3 (4.9-11.7 nm) by the thermal decomposition of complexes [MFe 2 O(CH 3 CO 2 ) 6 (H 2 O) 3 ] (M = Mn, Fe, Co, Ni) in tetraethylene glycol. The presence of surfactants leads to a decrease in the size and size distribution of the nanoparticles formed, while the use of microwave radiation significantly reduces the time for formation of the nanocrystalline oxides. The magnetic measurements showed ferrimagnetic ordering in the nanoparticles studied and their superparamagnetic behavior.The increased interest in nanosized materials is due to their unusual physical and chemical properties in comparison with bulk analogs, which are attributed both to the increased surface area along with decreased particle size and various size effects [1][2][3][4]. In the case of nanoparticles of spinel oxides containing paramagnetic ions, this leads to a situation, in which the spin state S s of these ions on the surface differs significantly from the spin state S 0 of these ions within the particle. As a result, more uncompensated spins are concentrated on the surface than within the bulk of the nanocrystal [4] (S s >> S 0 ) and since the concentration of paramagnetic ions on the nanoparticle surface is comparable with their concentration within the particle, this leads to a significant change in the magnetic properties of the nanoparticles in comparison with bulk samples with the same composition. Hence, not only particle size (the size factor) but also particle shape and state (defectivity) will affect the magnetic properties. In turn, these factors and, thus, the properties of the nanoparticles depend considerably on the method and conditions of nanoparticle formation, i.e., the prehistory of the nanoparticles [5]. However, a study of the effect of these factors on the magnetic properties has not produced a proper explanation in the literature, primarily due to the lack of reliable methods for the preparation of nanomagnetic particles with given size characteristics and shape.Magnetic spinels are useful materials for the development of controlled methods for the synthesis of nanoparticles. Thus, nanosized ferrites are commonly used in modern electronics due to their magnetic properties in the recording of information, sensor devices, and catalysts for various oxidation-reduction reactions.0040-5760/07/4305-0353

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Effect of formation conditions on the structure, morphology and magnetic properties of nanosized MIIFe 2 III O4 ferrites (M = Mn, Co, Ni) and Fe2O3

et al. 2007

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“…Therefore, detailed study of the process and, especially, of the mechanism of recently discovered [3,4] self-organization of microparticles of X-ray amorphous aluminum oxide in the course of gas-phase thermal hydrolysis is of particular importance. In the process, tubular particles (microtubes) of the composition Al 7 O 10 Cl .…”

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Radiochemical diagnostics of thermal hydrolysis of aluminum trichloride

et al. 2004

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Tubular alumina as a key component of new thermally stable ceramic materials

et al. 2014

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Cited by 3 publications

References 2 publications

Effect of formation conditions on the structure, morphology and magnetic properties of nanosized MIIFe 2 III O4 ferrites (M = Mn, Co, Ni) and Fe2O3

Effect of formation conditions on the structure, morphology and magnetic properties of nanosized MIIFe 2 III O4 ferrites (M = Mn, Co, Ni) and Fe2O3

Radiochemical diagnostics of thermal hydrolysis of aluminum trichloride

Tubular alumina as a key component of new thermally stable ceramic materials

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