Abstract
We have studied the microstructure of melt-growthGdBa2Cu3O7−δ (Gd123) bulk superconductors with the addition ofGd2Ba4CuMOx (abbreviatedas M2411 with M = Mo or Zr) particles by transmission electron microscopy. Gd123 bulks are prepared with nominal compositionsGd123+(0.4−x) Gd211+xM2411+0.1 BaO2 in a molarratio with x = 0–0.2. The addition of M2411 particles induced nanosized particles inside bulks.They are apparently distributed well under seeding positions, where fewerGd211 particles are located. The observed nanosized particles assigned asM2411 may play the role of flux pinning centres, leading to an enhancedJc. However, the additionof M2411 with x>0.12 leads to the appearance of excess liquid and macrodefects in the bulks. Enhancedinterfacial stress induced by the excess M2411 addition was found, together with modifiedlocal chemical compositions. These results account for both the suppression of thesuperconducting properties and the formation of the band structure in the present system.
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