Abstract
Chemical doping is considered as an economic and effective method to enhance the flux pinning properties of high-temperature superconducting materials. However, it is difficult to realize a large doping amount in textured grown bulk superconductors since the doped particles are prone to accumulate and affect the melt-textured growth of the bulk superconductors. In the present work, we introduced nanosized $\hbox{ZrO}_{2}$ particles into the Gd–Ba–Cu–O samples through the external liquid source by infiltration method. A large doping amount of $\hbox{ZrO}_{2}$ particles up to 20 mol% has been realized in finely grown Gd–Ba–Cu– O samples. Improvement in the trapped field has been found for low-level doped samples. The localized microstructure and distribution of the doped particles have been observed by scanning electron microscopy and discussed in this paper.
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