Reference : NONEQUILIBRIUM EFFECTS IN THE THERMAL-CONDUCTIVITY OF BI-BASED HIGH-TEMPERATURE SUPERCON...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/74807
NONEQUILIBRIUM EFFECTS IN THE THERMAL-CONDUCTIVITY OF BI-BASED HIGH-TEMPERATURE SUPERCONDUCTORS
English
Bougrine, Hassan mailto [Université de Liège - ULg > CARE "Le Réseau des bibliothèques de l'ULg" > Bibliothèque des Sciences et Techniques >]
SERGEENKOV, S. [> > > >]
Ausloos, Marcel mailto [Université de Liège - ULg > Département de physique > Physique statistique appliquée et des matériaux - S.U.P.R.A.S. >]
Cloots, Rudi mailto [Université de Liège - ULg > Département de chimie (sciences) > Chimie inorganique structurale - Doyen de la Faculté des Sciences >]
GRIDIN, V. V. [> > > >]
1994
Solid State Communications
Pergamon Press - An Imprint of Elsevier Science
91
7
571-575
International
0038-1098
[en] HIGH T(C) SUPERCONDUCTORS ; GRAIN BOUNDARIES ; ELECTRONIC TRANSPORT ; HEAT CONDUCTION ; FLUX PINNING AND CREEP
[en] Thermal conductivity of two Bi-based high temperature superconducting ceramics, 2212 and 2223, with a markedly different microstructure have been examined. A pulse technique has been used. Depending on the heating pulse duration, the more weak-links-containing 2223 sample shows either equilibrium or nonequilibrium behavior. The temperature dependence of the thermal conductivity between 110 K and 180 K is found to obey the Arrhenius law. The experimental observations are interpreted as a thermally activated heat flux motion through the polycrystalline grain boundaries with an energy barrier of nearly 10meV. It is likely due to a phase slip mechanism. An extra relaxation process due to the pore content/structure is thus emphasized in such regimes.
Researchers
http://hdl.handle.net/2268/74807

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