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Conductivity and Superconductivity of (Bi,Pb)_4Sr_3Ca_3Cu_4O_x Glass-Ceramics

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Gazda M., Kusz B., Sobiechowska E.
Acta Physica Polonica A
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2007
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vol. 111
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issue 5
713-719
EN
(Bi,Pb)-Sr-Ca-Cu-O glasses, annealed in proper conditions, transform into a granular metal and superconductor. As a result of annealing oxide superconductors belonging to the bismuth family (Bi,Pb)_2Sr_2CuO_x, (Bi,Pb)_2Sr_2 CaCu_2O_x, and (Bi,Pb)_2Sr_2Ca_2Cu_3O_x crystallize. (Bi,Pb)-Sr-Ca-Cu-O glass-ceramic samples were obtained by annealing the amorphous solid at temperatures between 500°C and 870°C. Their microstructure was studied with scanning electron microscopy, atomic force microscopy, and X-ray diffraction. The temperature dependence of resistivity in annealed samples was studied in a temperature range from 3 K to 300 K. In this work we present the influence of the microstructure on the electrical properties of the granular and disordered material composed of the 2201 and 2212 grains embedded in the nonmetallic matrix.
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