Growth conditions and properties of Y123/Y211 and Y123/Y2O3 bulks

Abstract

The single-grain YBCO samples were prepared by TSMG process. Two nominal compositions: 1 mol.Y123 + 0.25 mol.Y2O3 + 1.0 wt.% CeO2 (Y123/Y2O3) or 70 wt.% Y-123 + 30 wt.% Y-211 (Y123/Y211) and 1.0 wt.% CeO2 and two different types of substrates were tested. It is shown that the growth rate in both systems is influenced by segregation of CuO in to the nonsolidified part of the sample what causes stop of isothermal growth. Measured melt losses are lower for ZrO2 substrate than for Y2O3/Yb2O3 substrate what influence final microstructure of prepared bulk superconductors.