Synthesis of Ag-Sheathed (Bi,Pb)-2223 Tapes Using The Precursor of (Bi,Pb)2CuO4+(Sr,Ca)2CuO3
A new process of the synthesis of superconducting (Bi,Pb)-2223/Ag tapes by the powder-in -tube (PIT) process is described. Two precursor powders are used, one is the (Bi,Pb)2CuO4 phase and the other is a multiphase with an approximate overall composition SrCaCuO3. Using these precursor mixtures, we obtain the tapes with high density and well-aligned grains, and critical current densities (Jc) in the range of 6,000–10,000A/cm2 at 77K in self-field. The good results are likely to be related to the presence of a liquid phase existed during sintering. The liquid phase creates favorable thermodynamic and kinetic condition during sintering, and result in the high density and well-aligned grains. However an amorphous phase is formed at the grain boundaries during the solidification of the liquid, which would strongly reduce the Jc.
KeywordsDifferential Thermal Analysis Critical Current Density Precursor Powder Precursor Mixture Differential Thermal Analysis Data
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