Abstract
Crystals have been grown from samples of nominal molar contents 2.0 ⩽ Bi ⩽ 2.5, 1.0 ⩽ Sr ⩽ 2.0, 0.0 ⩽ Ca ⩽ 1.0 and 1.0 ⩽ Cu ⩽ 2.0. Samples as grown and some of them after being oxygenated, were identified by X-ray powder diffraction. Magnetization measurements revealed superconducting transitions up to 90 K for Bi 2Sr 2− m Ca m Cu 2O x samples with molar Ca contents as small as 0.10. The characterization of two not well known phases is also reported: orthorhombic Bi-2202 and tetragonal Bi-3302, with unit-cell parameters (Å) a=3.628(1), b=6.915(9), c=24.61(3); and a= b=15.006(4), c=25.39(1) respectively.
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