A structural transformation and its effect on the physical properties of the V-substituted Bi2Sr2Ca2Cu3O10+gamma system
Küçük Resim Yok
Tarih
1997
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Iop Publishing Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Systematic substitution of V in the Bi2-deltaVdeltaSr2Ca2Cu3O10+y system (delta = 0, 0.2, 0.4, 0.6, 0.8 and 1) was carried out in order to determine the effect of V ions on the phase formation and on the physical properties of the BSCCO 2223 system. The most interesting observation was structural transformation of the system from tetragonal to orthorhombic after delta = 0.6. A solid solubility limit for V was also found to exist. Resistivity and susceptibility studies have shown that high-T-c superconductivity exists up to delta = 0.6 and that the semiconducting-to-metallic transition or fully semiconducting behaviour occurs after this limit. A fractionally small but very-high-T-c transition at around 210 K was also observed, but it was not reproducible. Among the V-substituted samples the best electrical properties were obtained for delta = 0.2; T-c and T-0 were found to be 112 K and 92 K, respectively, the calculated value of J(c) was found to be 1.11 x 10(5) A cm(2) at 4.5 K and the thermal conductivity parameter kappa was found to be 6.4 mW cm(-1) K-1. By substituting the higher-valence state V5+ ions for Bi3+, the thermal treatment time is significantly reduced. The magnetic properties, IR and thermal conductivity results showed evidence of a strong coupling mechanism in the Bi2-deltaVdeltaSr2Ca2Cu3O10+y system.
Açıklama
Anahtar Kelimeler
Ca-Cu-O, 2223 Superconducting Ceramics, High-Tc, Thermal-Conductivity, Bi, Phase, Microstructure, Sb
Kaynak
Journal of Physics-Condensed Matter
WoS Q Değeri
Q1
Scopus Q Değeri
Q2
Cilt
9
Sayı
5
