Ba 2 YCu 3 O 7−x (BYCO) was prepared by “Spray Decomposition (SPD) method” varying conditions and characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM), and electric conductivity measurements. SPD method gave a remarkably larger grain size of BYCO compared with the conventional grinding method. The major phase of the initial product from SPD was tetragonal and did not show superconductivity. After annealed at 1223 K, the major phase became orthorhombic with a=3.89Å, b=3.83 Å, and c=11.66Å. Tc(m) and ΔTc(10–90%) were 93.4 K and 1.4 K, respectively.
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Shimazu et al. (1988) studied this question.