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Thermal Conductivity of Selenium
Author(s) -
Abdullaev G. B.,
Mekhtieva S. I.,
Sh. Abdinov D.,
Aliev G. M.,
Alieva S. G.
Publication year - 1966
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19660130203
Subject(s) - thermal conductivity , selenium , atmospheric temperature range , melting point , amorphous solid , materials science , melting temperature , softening point , discontinuity (linguistics) , analytical chemistry (journal) , thermodynamics , classification of discontinuities , electrical resistivity and conductivity , conductivity , thermal , thermal conduction , condensed matter physics , chemistry , composite material , crystallography , metallurgy , physics , mathematical analysis , mathematics , chromatography , quantum mechanics
The thermal conductivity λ of amorphous, crystalline, and liquid selenium (purity 99, %) is measured in the temperature range 80 to 525°K which includes the softening ( T ≈ 31°C) and melting points. The thermal conductivity of amorphous selenium increases linearly with temperature up to 304°K at which temperature there is a discontinuity involving a sharp increase of about 40%. Admixtures of Cd and Tl change the values of the discontinuity Δλ g and temperature T g . An admixture of Cd shifts the value of Δλ g from 0.44 × 10 −3 to 0.11 × 10 −3 cal/(cm s degree) and increases T g from 30.7 to 33.5°C. Heat treatment increases λ and changes its temperature profile. Admixtures of Tl remove the discontinuity. The thermal conductivity of selenium during melting undergoes a discontinuity of about 40% which is explained by the increase in the intermolecular distance from 3.46 to 3.74 Å. A photon thermal conductivity, which accounts for up to 30% of the overall thermal conductivity, is found in crystalline selenium at temperatures above about 350°K. The experimentally determined value of λ, its temperature dependence, the values of the softening and melting discontinuities and the photon parts agree well with theory.