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    STUDIA PHYSICA - Issue no. 2 / 2005  
         
  Article:   EFFECT OF ANNEALING TIME ON THE Bi1.6Pb0.4Sr1.6Ca2.0Cu2.8OX SYSTEM.

Authors:  S. SIMON, G. BORODI, T. FRENŢIU, S.D. ANGHEL, ALPAR SIMON.
 
       
         
  Abstract:  A superconducting sample with nominal composition Bi1.6Pb0.4Sr1.6Ca2.0Cu2.8Ox was investigated. It was annealed in air, at 845 oC, for 50, 150 and 200 hours. The samples were investigated via AC susceptibility measurements and XRD. The elemental content of the samples (concentrations and stoichiometric coefficients) was studied via plasma source atomic emission spectroscopy. It was established that the Pb content decreases linearly with the annealing time. The results of the investigations indicate that an extensive heat treatment could cause an alteration of the 2223 phase and its transformation in lower TC phases.  
         
     
         
         
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