Stability of superconducting phases in Bi-Sr-Ca-Cu-O and the role of Pb doping
S. X. Dou, H. K. Liu, A. J. Bourdillon, M. Kviz, N. X. Tan, C. C. Sorrell
DOI 10.1103/PhysRevB.40.5266 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The effects of heat treatment, partial oxygen pressure &), and Pb substitution on the oxygen nonstoichiometry and on the stability of superconducting phases in the Bi-Sr-Ca-Cu-O systems were examined. The Pb substitution promoted and stabilized the 110-K phase, with a reproducible zero resistance at 107 K & hardly affects the superconducting transition temperature (Tc) in Pb stabilized samples while a large variation of Tc in Bi-Sr-Ca-Cu-O & from 0.01 to 1.0 atm. The Cu3+ concentrations determined by a volumetric & over the range studied, so this ion is not critical for superconductivity in Bi-Sr-Ca-Cu-O, as it is in Y-Ba-Cu-O. The higher extra oxygen content obtained from iodometric titration is attributed to the oxygen associated with Bi5+ ions in Bi-O2 layers which are not measured by the volumetric method. Such ions result from cationic vacancies. In doped 2:2:2:3 compounds Pb4+ ions, most likely located in the Bi layers, lower the charge states of both Bi and Cu which are otherwise raised by cationic vacancies.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2Ca2Cu3O10+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| BiSrCaCu2O5.5+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure not reported | midpoint |
| BiSrCaCu2O5.5+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77 | Pressure not reported | zero_resistance |
| BiSrCaCu2O5.5+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 97 | Pressure not reported | midpoint |
| BiSrCaCu2O5.5+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | zero_resistance |
| BiSrCaCu2O5.5+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 105 | Pressure not reported | midpoint |
| BiSrCaCu2O5.5+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
| Bi0.8Pb0.2SrCaCu2O5.55+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | Pressure not reported | midpoint |
| Bi0.8Pb0.2SrCaCu2O5.55+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 66 | Pressure not reported | zero_resistance |
| Bi0.8Pb0.2Sr1Ca1Cu2O5.6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 109 | Pressure not reported | midpoint |
| Bi0.8Pb0.2Sr1Ca1Cu2O5.6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 107 | Pressure not reported | zero_resistance |
| Bi0.8Pb0.3SrCaCu2O5.6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 107 | Pressure not reported | midpoint |
| Bi0.8Pb0.3SrCaCu2O5.6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 104 | Pressure not reported | zero_resistance |
Similar papers
Influence of lead on the formation of the 110-K superconducting phase in the Bi-Sr-Ca-Cu-O compounds
similarity 0.97E. Chavira et al.
Source status unknown — claims are unverified
Effect of superimposed electrical and thermal gradients in superconducting polycrystalline Bi-Pb-Sr-Ca-Cu-O
similarity 0.96Richard A. Doyle & Vladimir V. Gridin
Source status unknown — claims are unverified
Superconducting-plasma resonance along the c axis in various copper oxide superconductors
similarity 0.96H. Shibata & T. Yamada
Source status unknown — claims are unverified
Possible structural phase transition near 210 K of single-phase Bi(Pb)-Sr-Ca-Cu-O superconducting ceramics
similarity 0.96He Yusheng et al.
Source status unknown — claims are unverified
Formation of the 110-K superconducting phase via the amorphous state in the Bi-Sr-Ca-Cu-O system
similarity 0.96Donglu Shi et al.
Source status unknown — claims are unverified
Fluctuation conductivity and microscopic granularity in Bi-based high-temperature superconductors
similarity 0.96A. R. Jurelo et al.
Source status unknown — claims are unverified