Decomposition of High Temperature Superconductors in Water

1993 ◽  
Vol 58 (7) ◽  
pp. 1548-1554 ◽  
Author(s):  
Olga Smrčková ◽  
Dagmar Sýkorová ◽  
Pavel Svoboda ◽  
Petr Vašek
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
High Temperature ◽  
High Temperature Superconductors ◽  
Relative Volume ◽  
Boiling Water ◽  
Nominal Composition ◽  
Superconducting Phases ◽  
Ceramic Superconductors ◽  
Superconductive Phase

Changes of magnetic susceptibility and electrical resistivity of ceramic superconductors of nominal composition YBa2Cu3O7-y and Bi1.4Pb0.6Sr2Ca2Cu3.6Ox observed during their soaking in water are reported. It was found that the YBa2Cu3O7-y superconductor is destroyed in few minutes by boiling water. At lower temperatures the hydrolysis reduces the volume of the superconductive phase, as seen from the susceptibility measurements. Reaction of Bi1.4Pb0.6Sr2Ca2Cu3.6Ox with water causes a decrease of the relative volume of both superconducting phases at a rate substantially higher for the high temperature one (Tc = 110 K).

Fluorine Substitution in High Temperature Superconductors

1999 ◽  
Vol 13 (09n10) ◽  
pp. 973-978 ◽  
Author(s):  
E. Bellingeri ◽  
G. Grasso ◽  
R. Gladyshevskii ◽  
E. Giannini ◽  
F. Marti ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Critical Temperature ◽  
Low Temperature ◽  
High Temperature Superconductors ◽  
Irreversibility Field ◽  
Fluorine Substitution ◽  
Superconducting Phases

Fluorine substitution in the Bi(2223), Bi(2212) and Tl(1223) superconducting phases was studied. We obtained superconducting structures, never observed before, of the Bi-based superconductors by a low temperature (200-400 °C) fluorination process. Fluorine substitutes completely the oxygen sites in the Bi layers and additional F atoms are inserted in the structure. As a consequence, changes in the arrangements of cation and anions were induced, especially in the Bi and partially in the Sr layer. F-doped Tl(1223) has been prepared in the same way as Bi(2223) and Bi(2212) (low temperature fluorination), but also starting from precursor containing fluorides of different elements. No significant differences in the crystal structure have been observed between the Tl-based samples with F inclusions and without. The critical temperature (116 K) remains unchanged but a significant increase of the irreversibility field at low temperature was found.

Thermal fluctuations near a phase transition probed through the electrical resistivity of high-temperature superconductors

2010 ◽  
Vol 78 (3) ◽  
pp. 310-316
Author(s):  
Noelia Cotón ◽  
Francisco J. Guzmán ◽  
Manuel V. Ramallo ◽  
Alexandre Ríos ◽  
Carolina Torrón ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrical Resistivity ◽  
High Temperature ◽  
High Temperature Superconductors ◽  
Thermal Fluctuations

DISTRIBUTION OF SUPERCONDUCTING PHASES IN THE Bi2Sr2CuO6 – CaCuO2 SYSTEM

1988 ◽  
Vol 02 (05) ◽  
pp. 1313-1319 ◽  
Author(s):  
S. Pekker ◽  
J. Sasvári ◽  
Gy. Hutiray
Keyword(s):  
Electrical Resistivity ◽  
Maximum Intensity ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Superconducting Phases ◽  
Wide Range

Bi 2 Sr 2 CuO 6 – CaCuO 2 system is studied in a wide range of compositions by electrical resistivity and X-ray diffraction measurements. The T c = 80 K phase can be observed in all compositions except the Ca free Bi 2 Sr 2 CuO 6, while the T c = 110 K phase is characteristic to the high CaCuO 2 concentration range, with maximum intensity at the nominal composition of Bi 2 Sr 2 Ca 2 Ca 5 Cu 6 O 16. The distribution of 20 K, 80 K and 110 K T c phases is estimated from powder X-ray measurements.

AC Magnetic Susceptibility in High Temperature Superconductors Irradiated with γ-Rays

1992 ◽  
Vol 134 (1) ◽  
pp. K29-K31 ◽  
Author(s):  
A. Leyva ◽  
J. C. Suarez ◽  
M. Mora ◽  
C. M. Cruz ◽  
D. Quesada
Keyword(s):  
Magnetic Susceptibility ◽  
High Temperature ◽  
High Temperature Superconductors ◽  
Ac Magnetic Susceptibility ◽  
Γ Rays

ROUNDING OF THE ELECTRICAL RESISTIVITY NEAR Tc OF VARIOUS HIGH-TEMPERATURE SUPERCONDUCTORS

1989 ◽  
pp. 165-170
Author(s):  
F. VIDAL ◽  
J.A. VEIRA ◽  
C. TORRóN ◽  
J.J. PONTE ◽  
F. MIGUÉLEZ ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
High Temperature ◽  
High Temperature Superconductors
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