Single crystal refinements of seven Sr1−x Ca x CuO2 structures (x = 0–0.573) and of Ca2−y Sr y CuO3 (y = 0 and 0.134)

Abstract Single crystals of Sr 1− x Ca x CuO 2 with x = 0–0.573 have been grown by a modified Bi 2 O 3 flux technique using different ratios of the earth alkali carbonates. Upto x = 0.573 the SrCuO 2 structure type was found. The changes of the lattice constants and of the atomic parameters are given. The different temperature dependence of the atomic parameters comparing undoped and doped crystals is discussed. From reaction mixtures with an excess of Ca (Ca:Sr ≥ 2:1) crystals with the composition Ca 1.866 Sr 0.134 · CuO 3 could be obtained. They crystallize in the Ca 2 CuO 3 structure type.