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    STUDIA PHYSICA - Ediţia nr.1 din 2009  
         
  Articol:   INFLUENCE OF THE SINTERING TEMPERATURE ON STRUCTURE, ELECTRIC AND MECHANICAL PROPERTIES OF THE POLYCRYSTALLINE (BI,PB):2223 SUPERCONDUCTORS.

Autori:  A.V. POP, ROXANA COLDEA, GABRIELA STIUFIUC, MARIANA POP. 		 
       
         
  Rezumat:  Bulk superconducting materials with nominal composition (Bi1.6Pb0.4)(Sr1,8Ba0,2)Ca2Cu3Oy were synthesized by solid state reaction method by using different sintering temperature ( in the range 8400C- 8500C). X-ray diffraction pattern shows that in all samples the majority phase is 2223, with some traces of Bi:2212. The electrical properties of the samples were examined by electrical resistance versus temperature, R(T). By using the linear behavior for R(T), the influence of sintering temperature on the parameters related to inter-grain resistivity and the percolation conduction were evaluated. To study the mechanical properties of Bi:2223 samples, Vickers micro hardness were measured. The variation of micro hardness with load is nonlinear, and described by Mayer’s law.

Keywords: Bi2223 bulk HTS, different sintering temperature, X-ay diffraction, electric resistance, Vickers micro hardness 		 
         
     
         
         
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