Abstract
Synthesis of polycrystalline YBa2Cu3O7−δ (YBCO) + x mol.% Y2Ba4CuMoO y (Y-24Mo1) (x=0.0, 0.1, 0.2, 1.0, 2.0 and 20.0) superconductors have been done in air via a standard solid state reaction technique. The effects of Y-24Mo1 particles on the microstructure and the superconducting transition temperature were systematically investigated through XRD and SEM techniques. When Y-24Mo1 was added to the YBCO, the orthorhombic structure maintained even at the highest concentration. Tiny peaks of Y-24Mo1 having (022) orientation and some other impurity were detected in the XRD spectrum when x=20.0. SEM results reveal the presence of some entities, and these entities changed with increase of Y-24Mo1 content. The Y-24Mo1 addition modifies the normal state resistivity of samples from metallic to semiconducting, and is accompanied by a two-step transition. Moreover, low Y-24Mo1 concentration leads to a relatively sharp superconducting transition and a broad transition take place for Y-24Mo1 addition greater than 0.2 mol.%. These results can be induced by the inhomogeneities, by the change of the effective coupling strength, and by the variation of the coupling between grains.
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This work was supported by the college basic scientific research operation cost of Gansu province (the manufacture and characteristic research of the optical gas sensing film materials and the Y series superconducting materials).
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Zhou, M., Sun, A., Han, P. et al. Doping Effect of Y2Ba4CuMoO y Particles on Microstructure and Superconducting Properties in Polycrystalline YBa2Cu3O7−δ . J Supercond Nov Magn 27, 365–370 (2014). https://doi.org/10.1007/s10948-013-2320-3
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DOI: https://doi.org/10.1007/s10948-013-2320-3