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Effect of temperature on the electrical resistivity of YBa 2 Cu 3 O 7− x /polyethylene composite materials
Author(s) -
Bhadrakumari S.,
Predeep P.
Publication year - 2009
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21340
Subject(s) - low density polyethylene , materials science , electrical resistivity and conductivity , polyethylene , composite material , percolation (cognitive psychology) , composite number , temperature coefficient , percolation threshold , thermal expansion , neuroscience , electrical engineering , biology , engineering
Heterogeneous materials composed of conducting YBa 2 Cu 3 O 7− x particles randomly dispersed inside an insulating low density polyethylene (LDPE) matrix were prepared. The resistivity of the composites was measured as a function of temperature between 293 and 400 K. A large positive temperature coefficient (PTC) of resistance was observed near 395 K. The mechanism of the PTC effect in the materials is related to the percolation behavior of the YBa 2 Cu 3 O 7− x /LDPE composites and the thermal expansion of the LDPE matrix. The intensity of the PTC effect for these composites was found to be as large as nine orders of magnitude. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers.