A study of the formation processes of the 2212 phase in the Bi-based superconductor systems

Abstract A study towards the identification of the reactions contributing to and accompanying the formation of the 2212 phase from oxides and carbonates by solid state reaction processes was conducted. The formation processes were investigated by thermal analysis, powder X-ray diffractometry and AC magnetic susceptometry. The 2212 phase was found to form from reactions between the 2201 phases (the non-superconducting pseudo-tetragonal and the superconducting monoclinic phases), Bi 6 Ca 7 O 16 , CuO and SrCO 3 . The 2201 phases were produced by the reactions of BiSrCuO or BiSrO compounds with SrCO 3 or CuO. The 2201 phases could also be formed through the direct reaction between Bi 2 CuO 4 and SrCO 3 .

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