Growth of single crystals of BaFe12O19 by solid state crystal growth

Highlights

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Single crystals of BaFe₁₂O₁₉ are grown by solid state crystal growth.

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A single crystal up to ∼130 μm thick (c-axis direction) grows on the seed crystal.

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The single crystal and surrounding ceramic matrix have similar composition.

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Micro-Raman scattering shows the single crystal has the BaFe₁₂O₁₉ structure.

Abstract

Single crystals of BaFe₁₂O₁₉ are grown for the first time by solid state crystal growth. Seed crystals of BaFe₁₂O₁₉ are buried in BaFe₁₂O₁₉+1 wt% BaCO₃ powder, which are then pressed into pellets containing the seed crystals. During sintering, single crystals of BaFe₁₂O₁₉ up to ∼130 μm thick in the c-axis direction grow on the seed crystals by consuming grains from the surrounding polycrystalline matrix. Scanning electron microscopy-energy dispersive spectroscopy analysis shows that the single crystal and the surrounding polycrystalline matrix have the same chemical composition. Micro-Raman scattering shows the single crystal to have the BaFe₁₂O₁₉ structure. The optimum growth temperature is found to be 1200 °C. The single crystal growth behavior is explained using the mixed control theory of grain growth.

Keywords

• BaFe₁₂O₁₉; 
• Single crystal; 
• Scanning electron microscopy; 
• Raman scattering; 
• Grain growth

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• • • Soure:sciencedirect