scholarly journals Critical Exponent of Conductivity and Percolation Phenomena of Carbon Black-Polyethylene Composites

1997 ◽  
Vol 117 (4) ◽  
pp. 371-380 ◽  
Author(s):  
Shuhei Nakamura ◽  
Kazuhiko Saito ◽  
Goro Sawa ◽  
Keiichi Kitagawa ◽  
A. Snarskii
Keyword(s):  
Carbon Black ◽  
Critical Exponent ◽  
Percolation Phenomena ◽  
Polyethylene Composites

Temperature and Thickness Dependences of Thermoelectric Properties of PbS/EuS Bilayers

2001 ◽  
Vol 691 ◽  
Author(s):  
Elena I. Rogacheva ◽  
Sergey N. Grigorov ◽  
Tatyana V. Tavrina ◽  
Olga N. Nashchekina ◽  
Yegor O. Vekhov ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Critical Exponent ◽  
Layer Thickness ◽  
Thermoelectric Properties ◽  
Size Quantization ◽  
Complex Character ◽  
Percolation Phenomena ◽  
Monotonic Character

ABSTRACTA non-monotonic character of the dependences of the thermoelectric properties of PbS/EuS/(001)KCl heterostructures on the PbS layer thickness d (d = 2 – 200 nm) was detected. Pronounced extrema at d ∼ 15 nm and less distinct extrema at d ∼ 30 nm and d ∼ 100 nm were observed. It is suggested that the complex character of the dependences is caused by the competition between percolation phenomena and size quantization. The critical exponent for the electrical conductivity (t = 1.6 ± 0.15) is determined.

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