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    STUDIA PHYSICA - Ediţia nr.1-2 din 2018  
         
  Articol:   STUDY OF STRUCTURAL, MORPHOLOGICAL AND ELECTRICAL PROPERTIES IN THE (Bi1.6Pb0.4)(Sr1.8Ba0.2)Ca2(Cu1-xGdx)3Oy SUPERCONDUCTORS.

Autori:  C. LUNG, D. MARCONI, A. POP.
 
       
         
  Rezumat:  
DOI: 10.24193/subbphys.2018.14

Published Online: 2018-12-20
Published Print: 2018-12-20
pp. 133-142

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X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and electrical resistivity measurements are performed to investigate some physical properties of (Bi1.6Pb0.4) (Sr1.8Ba0.2) Ca2(Cu1-xGdx)3Oy superconducting samples fabricated at sintering temperatures of 840 0C and 845 0C and the uniaxial pressures of 196MPa and 392MPa respectively. The samples were prepared by standard solid-state reaction methods. XRD measurements show that the samples obtained at 840 0C contain two phases. With the increase of the sintering temperature at 845 0C, a decrease in the diffraction peaks of the phase 2212 is observed, and with the increase of the pressure at 392MPa this phase falls below 10%. SEM analysis show that the superconductors have a uniform surface, but the size of the granules changes so that the sample sintered at 845 0C and the uniaxial pressure of 392 MPa has the best crystallinity.

Keywords: BiPb 2223 doped superconductors, XRD, SEM, electrical properties
 
         
     
         
         
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