Preparation of strontium hexaferrite based materials by solution combustion: the effect of charges arising in precursors and an external magnetic field

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The formation of electric charges during the synthesis of complex oxide materials based on strontium hexaferrite SrFe12O19, including doped with lanthanum and cobalt ions, via the combustion of nitrate-organic precursors has been established. Precursors included polyvinyl alcohol or glycine as organic component. The intensity of charge generation was lower for precursors containing a larger amount of organic component. Data on the magnetic characteristics of the samples were obtained: magnetization, coercive force. The influence of an external magnetic field during the synthesis of hexaferrites significantly affected the coercive force of the samples and allowed to increase its values due to the formation of extended ensembles of nanoparticles. At the same time, such an effect on samples with a relatively low level of charge generation during precursor combustion was more effective. The relationship between the factors influencing the formation of extended aggregates is analyzed. The Sr0.8La0.2Fe11.8Co0.2O19 samples had the maximum coercive force. One of the techniques for increasing the coercive force is a two-stage thermomagnetic treatment, including a low-temperature stage. The formation of branched extended structures at the macro- and micro-levels was found during the combustion of glycine-containing precursors.

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作者简介

A. Ostroushko

Ural Federal University

编辑信件的主要联系方式.
Email: alexander.ostroushko@urfu.ru
俄罗斯联邦, Yekaterinburg, 620002

I. Gagarin

Ural Federal University

Email: alexander.ostroushko@urfu.ru
俄罗斯联邦, Yekaterinburg, 620002

E. Kudyukov

Ural Federal University

Email: alexander.ostroushko@urfu.ru
俄罗斯联邦, Yekaterinburg, 620002

T. Zhulanova

Ural Federal University

Email: alexander.ostroushko@urfu.ru
俄罗斯联邦, Yekaterinburg, 620002

A. Permyakova

Ural Federal University

Email: alexander.ostroushko@urfu.ru
俄罗斯联邦, Yekaterinburg, 620002

O. Russkikh

Ural Federal University

Email: alexander.ostroushko@urfu.ru
俄罗斯联邦, Yekaterinburg, 620002

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2. Fig. 1. X-ray diffractograms of samples of the gross composition SrFe12O19 (heat treatment at 650 ° C for 48 hours) obtained from nitrate-organic precursors of the following composition (φ = 1): 1 — PVP; 2 — PVS; 3 — glycine.

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3. Fig. 2. Values of the coercive force Hc (a) and the residual specific magnetization MR (b) for SrFe12O19 samples at different annealing temperatures.

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4. Fig. 3. Coercive force of SrFe12O19 samples depending on the applied magnetic field (a) and the intermediate annealing temperature (b) at field strengths of 3 (1) and 10 kE (2).

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5. Fig. 4. Coercive force of samples synthesized with different amounts of PVS (φ = 1 — curve 1; φ = 2 — curve 2).

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6. 5. Volumetric aggregation of SrFe12O19 nanoparticles (a), the appearance of extended aggregates of nanoparticles (b, c), largely disaggregated particles (d).

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7. Fig. 6. Interaction potentials of nanoparticles (a), curves from top to bottom: electrostatic repulsion at precursor charges equivalent to 1, 10, 100 V, respectively; magnetic interaction, van der Waals forces; resulting curves for the same charge values (b): from top to bottom - 100, 10 and 1 V.

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8. Fig. 7. Electron micrographs of strontium hexaferrite samples obtained from precursors containing glycine: a, b, c — the appearance of a jagielike structure; d — the same on the slice; e — the inner part of the “fiber”.

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