Metallic Ag Addition Effects on Y_1Ba_2Cu_3O_<7-x> Superconducting Thick Films

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Metallic Ag addition effects on Y_1Ba_2Cu_3O_<7-x> (YBCO) thick film were investigated from the viewpoints of both superconducting properties and microstructure. With the addition of Ag_2O (the starting material), the current density at 77 K (J_c), as well as the zero-resistivity temperature (T_<c,off>), was improved, resulting in J_c=1300 A/cm^2 and T_<c,off>=93 K. The YBCO superconducting phase partly decomposed to yield Y_2Ba_1Cu_1O_5, Ba_1CU_1O_2 and CuO as a result of the addition of metallic Ag, which varied from Ag_2O. Ba_1Cu_1O_2, with a melting point around 900℃, promoted liquid phase sintering for YBCO. Although the YBCO superconducting phase decreased by 40 vol% as a result of these decompositions, J_c and T_<c,off> improved, compared with those in undoped YBCO thick film, because the YBCO was grown into a large plate and densified, and its c-direction was oriented perpendicular to the substrate.
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1993-10-15