Abstract
The formation process of barium hexaaluminate (BaO 6Al2O3) from BaCO3/γ‐Al2O3 powders or hydrolyzed alkoxides was studied by analytical electron microscopy. Barium hexaaluminate is produced by a two‐step solid‐state reaction from BaCO3 and Al2O3 via formation of BaO·Al2O3. Marked grain growth and inclusion of nonequilibrium phase were inevitable in this powder mixture process. However, in an alkoxide‐derived precursor, homogeneous mixing of components is attained and hence the formation of BaO·6Al2O3 proceeds readily. Powders obtained by this latter route consisted of fine planar particles with a uniform size and retained a large surface area (20.2 m2/g) even after heating at 1300°C. Electron diffraction results implied that suppression of crystal growth along the c axis is the reason for the large surface area of BaO·6Al2O3.
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