Growth of oriented thick films of bafe12o19 by reactive diffusion

Abstract

Single crystal growth of BaFe12O19 by the solid state crystal growth method was attempted. Seed crystals of α- Fe2O3 were pressed into pellets of BaFe12O19 + 2 wt % BaCO3 and heat-treated at temperatures between 1150°C and 1250°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 BaFe12O19. 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 BaFe12O19. XRD showed that the reaction layer shows a strong degree of orientation in the (h00)/(hk0) planes in the sample sintered at 1200°C. BaFe12O19 layers with a degree of orientation in the (hk0) planes could also be grown by heat-treating an α-Fe2O3 seed crystal buried in BaCO3 powder.