Magnetic materials based on iron-silicon containing frameworks

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Polyferrophenylsiloxanes based on iron(III) chelate and polyphen-ylsiloxane with various ratios of siloxane and sodium hydroxide under mechanochemical activation conditions have been obtained. It is shown that after precipitation with petroleum ether, the yields of polymers are in the range of 37-52%. The polyferrophenylsiloxane composition closest to the given composition was obtained at a Si : Na ratio of 1. The obtained compo-sites were studied by IR spectroscopy, diffractometry, gel chromatography, and thermogravimetry. An XRD study showed the incorporation of iron at-oms into the siloxane structure. The presence of sodium ions during the course of the reaction in subsequent syntheses made it possible to bind the released acetylacetone and obtain polyferrophenylsiloxane with a given Si : Fe ratio. However, with a further increase in the hydroxide content, the Si : Fe ratio was violated. The study of the magnetic properties of polyferro-phenylsiloxanes showed that they are superparamagnets. After heating them to 600°C, the magnetization sharply increases (magnetic saturation) and hysteresis is observed.

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N. Shapkin

Far Eastern Federal University

Email: d.edd@mail.ru
俄罗斯联邦, Vladivostok

I. Khal’chenko

Far Eastern Federal University

Email: d.edd@mail.ru
俄罗斯联邦, Vladivostok

E. Tokar

Far Eastern Federal University; Sakhalin State University

编辑信件的主要联系方式.
Email: d.edd@mail.ru
俄罗斯联邦, Vladivostok; Yuzhno-Sakhalinsk

A. Matskevich

Far Eastern Federal University; Sakhalin State University

Email: d.edd@mail.ru
俄罗斯联邦, Vladivostok; Yuzhno-Sakhalinsk

V. Pechnikov

Far Eastern Federal University

Email: d.edd@mail.ru
俄罗斯联邦, Vladivostok

K. Pervakov

Far Eastern Federal University

Email: d.edd@mail.ru
俄罗斯联邦, Vladivostok

V. Zubchenko

Far Eastern Federal University

Email: d.edd@mail.ru
俄罗斯联邦, Vladivostok

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2. Fig. 1. TGA data of polymers 1 (a), 2 (b), 3 (c).

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3. Fig. 2. Gel chromatograms of polymers 1 (a), 2 (b), 3 (c).

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4. Fig. 3. IR spectra of polymers 1 (a), 2 (b), 3 (c).

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5. Fig. 4. Diffraction patterns of polymers 1 (a), 2 (b), 3 (c).

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6. Fig. 5. Dependence of specific magnetization on the strength of the applied field for polymers 1 (a), 2 (b) and 3 (c).

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7. Fig. 6. Dependence of the specific magnetization of the sample on temperature for polymers 1 (a), 2 (b), 3 (c).

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8. Fig. 7. Dependence of specific magnetization on the strength of the applied field for polymers 1 (a), 2 (b), 3 (c) after their calcination.

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