ChemInform Abstract: Structures of the Superconducting Oxides Bi2(Sr1‐xCax)2CuO8‐δ and Bi (Sr1‐yCay)3Cu2O10‐δ with 0 ≤ x ≤ 0.3 and 0.16 ≤ y ≤ 0.33.

Abstract
The title oxides are prepared by annealing mixtures of binary oxides or carbonates in air (corundum crucible, 1070‐1255 K).