,
"Tl-based cuprate superconductors doped with rare earth oxides"
, in Supercond. Sci. Techn., Vol. 18, Seite(n) 87 - 91, 2005, Tl-based cuprate superconductors doped with rare earth oxides
Mario H. Eder and Gerhard Gritzner
Supercond. Sci. Techn., 18 (2005) 87 - 91
Original Titel:
Tl-based cuprate superconductors doped with rare earth oxides
Sprache des Titels:
Englisch
Original Kurzfassung:
Precursor materials for superconductors with nominal starting compositions of (Tl0.6Pb0.5)(Ba0.2Sr0.8)2(Ca, RE)2Cu3Oy (RE: Y, La, Pr, Sm, Dy) were made via the evaporation of aqueous strontium–barium–calcium–copper–
nitrate solutions followed by calcination at 900 ◦C in air. The stoichiometric amounts of the doping oxides were added by co-attrition. Sintering of the specimens was carried out inside a silver foil under flowing oxygen at 925 ◦C for 12 min and at 910 ◦C for 10 h. High quality Tl-1223 and Tl-1212
materials with well connected grains and Tc(0) values between 75 and 115 K were produced. The DeltaT(90−10%) values ranged from 2 to 18 K. Bulk phase jc-values between 40 and 1400 A cm−2 were obtained. Annealing improved the critical current densities. Two-step transitions were generally observed.
Sprache der Kurzfassung:
Englisch
Englischer Titel:
Tl-based cuprate superconductors doped with rare earth oxides
Englische Kurzfassung:
Precursor materials for superconductors with nominal starting compositions of (Tl0.6Pb0.5)(Ba0.2Sr0.8)2(Ca, RE)2Cu3Oy (RE: Y, La, Pr, Sm, Dy) were made via the evaporation of aqueous strontium–barium–calcium–copper–
nitrate solutions followed by calcination at 900 ◦C in air. The stoichiometric amounts of the doping oxides were added by co-attrition. Sintering of the specimens was carried out inside a silver foil under flowing oxygen at 925 ◦C for 12 min and at 910 ◦C for 10 h. High quality Tl-1223 and Tl-1212
materials with well connected grains and Tc(0) values between 75 and 115 K were produced. The DeltaT(90−10%) values ranged from 2 to 18 K. Bulk phase jc-values between 40 and 1400 A cm−2 were obtained. Annealing improved the critical current densities. Two-step transitions were generally observed.
for samples containing rare earth cations.
Rare earth oxides favoured the formation of the Tl-1212 phase.
Annealing at 750 ◦C for 50 h under flowing oxygen improved the transport
properties of these samples.
Journal:
Supercond. Sci. Techn.
Volume:
18
Seitenreferenz:
87 - 91
Erscheinungsjahr:
2005
Notiz zum Zitat:
Tl-based cuprate superconductors doped with rare earth oxides
Mario H. Eder and Gerhard Gritzner
Supercond. Sci. Techn., 18 (2005) 87 - 91
Anzahl der Seiten:
5
Notiz zur Publikation:
Tl-based cuprate superconductors doped with rare earth oxides
Mario H. Eder and Gerhard Gritzner
Supercond. Sci. Techn., 18 (2005) 87 - 91
Forschungs-