Abstract
The Ca-doped Bi-2201 system with nominal composition Bi2Sr2−x Ca x CuO6+δ (x=0.1,0.3,0.5,0.7,0.9) was prepared by sol–gel method and investigated by X-ray diffraction, transmission electron microscopy and resistance measurements. It can be found that the Ca-doped Bi-2201 system was composed of Bi-2201 phase containing Ca (main phase) and a small quantity of Bi16(Sr,Ca)14O38 (impurity). For the main phase, the b ∗ component of the modulation wave vector decreases while the c ∗ component increases with the increase of calcium content. The evolutional mechanism of the modulation wave vector, the correlation between superconductivity and modulation wave vector were also discussed.
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