Abstract
Large Ag2O doped Gd–Ba–Cu–O (GdBCO) single grains containingGd2Ba4CuNbOy (Gd-2411(Nb), a niobium compound) have been fabricated successfully in air by a cold-seedingmelt-processing technique using a generic Mg–Nd–Ba–Cu–O seed crystal. An optimum amount ofBaO2 addition to the precursor composition is found to suppress Gd/Ba solid-state substitutionin the superconducting phase composition. A study of the microstructures andsuperconducting properties of these GdBCO bulk superconductors containingsuch Gd-2411(Nb) phases is presented. A trapped field of over 0.9 T has beenrecorded finally at 77 K for the GdBCO/Ag contained Gd-2411(Nb) with 26 mmdiameter.
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