Precursor powders of Y1Ba2Cu3O6+x (123) derived from spray roasting were calcined in a batch rotary kiln. The optimum conditions were 15 min in air at temperatures between 920° and 940°C for 1.5 vol% solid loading. Pure 123 was formed in a single calcination step from homogeneous, micrometer‐sized precursor material containing Y2O3, CuO, and BaCO3. Rotation speed did not affect the product quality, but longer calcination times are needed at higher loadings. Product agglomeration increased with increasing loading and decreasing rotation speed. In nitrogen, 123 decomposed so that a pure product could not be obtained. The BaCO3 decomposition is the rate‐limiting step in the calcination. The presence of Ba(NO3)2 in the precursor led to formation of intermediate phases.
|Number of pages||5|
|Journal||Journal of the American Ceramic Society|
|State||Published - Feb 1993|