We have investigated the effect of oxygen partial pressure, the initial composition, and the addition of CeO2 and/or Pt on the grain growth of Nd4Ba2Cu2O10 (Nd-422) in the Ba-Cu-O liquid. Logarithmic plots of the mean diameter of Nd-422 under various oxygen levels as a function of the holding time showed the power law behavior with the slope of 1/3, which suggested that the grain growth of Nd-422 could be explained in terms of the Ostwald ripening theory. A reduction of oxygen partial pressure, the shift of the initial composition toward Barich direction, and a combined addition of Pt and CeO2 could suppress the coarsening of Nd-422. Furthermore, a combination of these techniques was found to be effective in refining the Nd-422 in the Nd-123 matrix, which led to an enhancement of Jc values.
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