ISSN:
1432-0630
Keywords:
72.20
;
66.70
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract The dc and thermal conductivities of five different compositions of the chalcogenide glass system Se75Ge25−x Sb x have been studied in a temperature range below T g. The dc conductivity results indicate that each composition has a single activation energy in the considered temperature range. The coefficient of thermal conductivity increased linearly with temperature below T g for the compositions investigated. The increase of Sb content in the chalcogenide glass system leads to an increased coefficient of electrical conductivity σ, an increased coefficient of thermal conductivity ψ, and to a decreased activation energy E σ and pre-exponential factor σ0. The observed compositional dependencies of σ and E σ have been correlated with the increase of weak bond density and the decrease of covalent bond density in the structure of the compositions investigated with increasing Sb content at the expense of Ge content. The decrease in σ0 and the increase in ψ has been, respectively, correlated with the decrease in mobility and the increase in phonon velocity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00334218
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