Preparation of Strontium Hexaferrite-Based Materials by Solution Combustion: Effects of Charges Arising in the Precursors and an External Magnetic Field
A. A. Ostroushko, I. D. Gagarin, E. V. Kudyukov, T. Yu. Zhulanova, A. E. Permyakova, O. V. Russkikh
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引用次数: 0
Abstract
The generation of electric charges during the combustion of nitrate organic precursors in the synthesis of strontium hexaferrite SrFe12O19-based complex oxide materials, including those doped with lanthanum and cobalt ions, was established. The precursors included polyvinyl alcohol or glycine. The intensity of charge generation was lower for precursors containing a larger amount of the organic component. Magnetic characteristics of the samples (magnetization, coercive field) were measured. An external magnetic field applied during the hexaferrite synthesis significantly affected the coercive field of the samples, which could be increased via the formation of extended ensembles of nanoparticles. The effect was more pronounced for samples with a moderate level of charge generation. The relationship between the factors influencing the formation of extended aggregates was analyzed. The maximum coercive field was found for Sr0.8La0.2Fe11.8Co0.2O19. One way to increase the coercive field is a two-stage magnetic heat 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.
期刊介绍：
Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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