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http://dx.doi.org/10.4283/JMAG.2014.19.4.333

Growth of Oriented Thick Films of BaFe12O19 by Reactive Diffusion  

Fisher, John G. (School of Materials Science and Engineering, Chonnam National University)
Vu, Hung (School of Materials Science and Engineering, Chonnam National University)
Farooq, Muhammad Umer (School of Materials Science and Engineering, Chonnam National University)
Publication Information
Journal of Magnetics / v.19, no.4, 2014 , pp. 333-339 More about this Journal
Abstract
Single crystal growth of $BaFe_{12}O_{19}$ by the solid state crystal growth method was attempted. Seed crystals of ${\alpha}-Fe_2O_3$ were pressed into pellets of $BaFe_{12}O_{19}$ + 2 wt% $BaCO_3$ and heat-treated at temperatures between $1150^{\circ}C$ and $1250^{\circ}C$ for up to 100 hours. Instead of single crystal growth taking place on the seed crystal, BaO diffused into the seed crystal and reacted with it to form a polycrystalline reaction layer of $BaFe_{12}O_{19}$. The microstructure, chemical composition and structure of the reaction layer were studied using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), x-ray Diffraction (XRD) and micro-Raman scattering and confirmed to be that of $BaFe_{12}O_{19}$. XRD showed that the reaction layer shows a strong degree of orientation in the (h00)/(hk0) planes in the sample sintered at $1200^{\circ}C$. $BaFe_{12}O_{19}$ layers with a degree of orientation in the (hk0) planes could also be grown by heat-treating an ${\alpha}-Fe_2O_3$ seed crystal buried in $BaCO_3$ powder.
Keywords
$BaFe_{12}O_{19}$; single crystal growth; oriented thick film; microstructure; Raman scattering;
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