Abstract
Abstract In this study, the glass samples with nominal composition of Bi 2 Sr 2 Ca 2 Cu 3− x Pr x O 10+ y , where x = 0.5, were fabricated using conventional melt quenching technique. After appropriate heat treatments, the glass–ceramic samples obtained showed a deformed and multiphase structure. While the a (= b )-axis was nearly unchanged, the c -axis was obtained to be smaller than that of the unsubstituted Bi-2223 system. From the resistance versus temperature measurements, a semiconducting type behavior down to T c was observed. The best T c value was obtained to be 46 K and T zero 29 K for the sample heat treated at 1123 K (850 °C) for 60 h. The Pr-substituted Bi-2223 glass–ceramic samples showed negative thermoelectric power, indicating that the dominant carriers are electrons in the samples. “ Two-band model with linear T-term ” was used to analyze the TEP data. A rapid rise in thermal conductivity, κ , was obtained just below T c . This suggests an enhancement of the quasiparticle contribution to the heat conductivity and so an increase of the quasiparticle mean free path.
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