Title :
The influence of oxygen partial pressure on growth of the (Hg,Re)-1223 intergrain junction
Author :
Oliveira, F.D.C. ; Passos, C.A.C. ; Fardin, J.F. ; Simonetti, D.S.L. ; Passamai, J.L., Jr. ; Belich, H. ; de Medeiros, E.F. ; Orlando, M.T.D. ; Ferreira, M.M., Jr.
Author_Institution :
SUPERA, Univ. Fed. do Espirito Santo, Vitoria-ES
fDate :
3/1/2006 12:00:00 AM
Abstract :
Hg0.82Re0.18Ba2Ca2Cu 3O8+delta polycrystalline samples were successfully obtained by using different oxygen partial pressure in the annealing treatment of the precursor ceramic. The doping state was confirmed by X-ray powder diffraction pattern analysis and by observing distinct thermopower values at room temperature. Also, the intergrain regions have shown an improvement in the critical current density when using the precursor preparation with 10% O2 and 90% Ar (optimal doped). The optimal doped sample has presented the highest alpha exponent of the Jcprop[1-(T/Tc)2 ]alpha dependence. For the case of (Hg,Re)-1223 polycrystalline superconductor applications, the alpha exponent can be used as a junction quality parameter
Keywords :
X-ray diffraction; annealing; argon; barium compounds; calcium compounds; critical current density (superconductivity); doping; high-temperature superconductors; mercury compounds; rhenium compounds; thermoelectric power; 293 to 298 K; Ar; Hg0.82Re0.18Ba2Ca2Cu 3O8+delta:Ar; HgRe-1223 intergrain junction; O2; X-ray powder diffraction pattern analysis; annealing treatment; critical current density; distinct thermopower values; junction quality parameter; optimal doping state; oxygen partial pressure; polycrystalline superconductor samples; precursor ceramic; precursor preparation; room temperature; Annealing; Argon; Ceramics; Critical current density; Doping; Mercury (metals); Pattern analysis; Powders; Temperature; X-ray diffraction; (Hg,Re)-1223 samples; Critical current density; high-; thermoelectric power;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.861062
