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Thermopower of YBa 2 Cu 3 O 7‐δ –Ag Composites
Author(s) -
Muralidharan Pottayil Uma Devi,
Paulose Kannai V.,
Koshy Jacob,
Damodaran Alathoor D.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb06821.x
Subject(s) - seebeck coefficient , superconductivity , electrical resistivity and conductivity , materials science , percolation (cognitive psychology) , phonon drag , condensed matter physics , percolation threshold , composite number , volume fraction , high temperature superconductivity , composite material , thermal conductivity , electrical engineering , physics , engineering , neuroscience , biology
The percolation behavior of normal‐state thermopower, resistivity, and superconductivity have been studied in YBa 2 Cu 3 O 7‐δ ─Ag (YBCO─Ag) composite systems. The normal‐state resistivity and thermopower show a percolation threshold at a Ag volume fraction ( V Ag ) of 20% to 30%, whereas the superconducting network shows a threshold at a V Ag of ≅70% to 80%. The results obtained from this study show that the YBCO─Ag composite obtained from Ag 2 O and YBCO powders is uniformly distributed with Ag and YBCO remaining as separate phases without changing their characteristics. The measurements of thermopower indicate that the normal‐state thermopower and phonon‐drag thermopower are affected by the Ag addition. The stability of YBCO is increased when it is in composite form.