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Properties of Li-doped, polycrystalline, melt-textured, BiSrCaCuO tapes prepared by powder-in-tube processing

Physica C Superconductivity
Publication Date
DOI: 10.1016/0921-4534(91)91326-y
  • Physics


Abstract The effects of Li on Ag-sheathed Bi 2Sr 2CaCu 2O 8+x tapes have been studied by considering Li substitutions for Sr and Cu and Li additions to stoichiometric Bi 2Sr 2CaCu 2O 8+x. The materials were prepared by the powder-in-tube method. As the Li substitution reduces the melting temperature by as much as 160 K, careful control of the processing conditions is required to obtain superconductivity in Li-doped samples. Here we report on the effects upon J c ( B, T) and upon T c . J c ( B) at 4.2 K and 20 K are reported. Due to a lack of phase purity, Li reduced the overall J c of the tapes. At 20 K, however, the Li-doped material is much less dependent upon B, indicating that Li substitution may provide enhanced pinning at high field.

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