Thermal and superconducting properties of glass-ceramic HTc BiSrCa(CuPr)O system
Küçük Resim Yok
Tarih
2008
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Sa
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, the glass samples with nominal composition of Bi2Sr2Ca2Cu3-xPrxO10+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 degrees 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, k, 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. (c) 2007 Elsevier B.V. All rights reserved.
Açıklama
Anahtar Kelimeler
High-T-c superconductors, crystallization kinetics, thermal conductivity, thermoelectric power
Kaynak
Journal of Materials Processing Technology
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
196
Sayı
1-3
