Y 2 BaCuO 5 (211) and liquid (L=3 BaCuO 2 :2CuO) were used as the precursor materials to study the effect of additions of BaSnO 3 and PtO 2 on the coarsening behaviour of 211 particles in the liquid above the peritectic temperature of YBa 2 Cu 3 O 6+x (123), and the magnetic properties after melt texturing. Additions of BaSnO 3 and PtO 2 both reduced the coarsening of 211, but PtO 2 did so much more effectively. The PtO 2 additions were found to refine 211 by altering the 211/liquid interfacial energy and/or Y diffusivity, and not by acting as heterogeneous nucleation sites. BaSnO 3 additions were found to not be inert in the melt. They reduce 211 coarsening by acting as a Y sink. Magnetization measurements at 20, 40 and 60 K on crushed melt-textured 123 samples showed enhanced intragrain flux pinning effects in samples prepared from 211+L+PtO 2 as compared with 211+L+BaSnO 3 or 211+L precursor samples.
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Varanasi et al. (1994) studied this question.
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