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    STUDIA PHYSICA - Issue no. 2 / 2004  
         
  Article:   STRUCTURAL INVESTIGATIONS OF (BI,PB):2223 HIGH TEMPERATURE SUPERCONDUCTOR.

Authors:  A.V. POP, D. MARCONI, G. ILONCA, M. POP, J.M. LEBRETON, L. LECHEVALIER.
 
       
         
  Abstract:  The physical properties of HTS are strongly influenced by nanoscale processes. The effect of Cu partial substitution by (Fe+Zn) on structural properties of (Bi,Pb):2223 HTS were investigated by X-ray diffraction and Mössbauer spectroscopy measurements. By increasing Zn concentration, the volume fraction of the major phase Bi:2223 decreases and the volume fraction of Bi:2212 increases. All Mössbauer spectra consist in a paramagnetic doublet, slightly dissymmetric, typical for Fe in superconducting compounds. The two contributions can be attributed either to two types of sites in the same compound, or to two types of compounds.  
         
     
         
         
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