Pre-Ceramic Nanostructured Liznmn-Ferrite Powders: Synthesis, Structure, and Electromagnetic Properties
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PRE-CERAMIC NANOSTRUCTURED LIZNMN-FERRITE POWDERS: SYNTHESIS, STRUCTURE, AND ELECTROMAGNETIC PROPERTIES K. D. Martinson,1, 3 A. A. Ivanov,2 I. B. Panteleev,2 and V. I. Popkov1 Translated from Steklo i Keramika, No. 6, pp. 16 – 23, June, 2020. Nanocrystalline LiZnMn-ferrite powders were synthesized by solution combustion at various glycine-nitrate ratios (G/N = 0.2, 0.4, ..., 1.4). Elemental analysis showed that the composition of the obtained samples corresponds to the ferrite-spinel Li0.45Zn0.05Mn0.06Fe2.43O4. Scanning electron microscopy showed that the compositions possess a porous microstructure and a developed surface; x-ray phase analysis attests that the synthesized LiZnMnFe-spinel is single-phase and possesses a high degree of crystallinity (to 99%). It was shown that the magnetic and dielectric characteristics of the obtained samples systematically change depending on the redox ratio of the reaction mixture and reach maximum values at stoichiometric value G/N = 0.4 – 0.6. Key words: glycine-nitrate synthesis, LiZnMn-ferrites, nanoparticles, electromagnetic properties.
Interest in ferrites and the magnetic materials based on them has continued to grow dynamically in recent decades, which is graphically demonstrated by the number of publications for inquiries for ‘ferrite’ and ‘magnetic particles’ in the Scopus and Web of Science databases, whose number consistently doubles every three to four years. Aside from purely scientific interest, continuous growth is observed in the industrial production of functional materials based on ferrites with different composition and structure; for example, from 1995 to 2005 the global production of magnetically soft ferrites alone increased from 200 to 410 tons/yr [1]. Interest in multi-component ferrites with variable composition is associated with the possibility of using these materials in the production of dual-use microwave devices, ferrite cores, magnetic information carriers, magnetic liquids, gauges, and sensors [2 – 5]. In addition active study of magnetic nanoparticles in recent years has led to the discovery of many new spheres of their possible application, such as magnetically controlled catalysis, photocatalysis, diagnostics of oncological diseases, purification of wastewater, and so forth [6 – 10]. The use of nanostructured multi-component systems based on ferrites makes it possible not only to expand their range of application but also significantly improve the functional properties of the existing electromagnetic materials, including microwave porcelain based on lithium ferrites [11, 12]. 1 2 3
Lithium-zinc-manganese ferrites (LiZnMn-ferrites, below) are a subclass of lithium ferrites and are now used mainly in the production of microwave devices, where they have shown high performance owing to their distinct electromagnetic properties [13]. One of the main problems of materials of this type is instability of the electromagnetic characteristics of the end product, which in turn directly depends on several basic factors — the phase com
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