The effect of interface angle on the thermal conductivity of Si/Ge superlattices

2021 ◽  
Author(s):  
Ying-Guang Liu ◽  
Guo-Liang Ren ◽  
Aleksandr Chernatynskiy ◽  
Xiao-Feng Zhao
Keyword(s):  
Thermal Conductivity ◽  
Coherent Transport

The special interface angle arrangement induces coherent transport of phonons and significantly improves the thermal conductivity.

Microscopic Origin of the Composition-Dependent Change of the Thermal Conductivity in Boron Carbides

1987 ◽  
Vol 97 ◽  
Author(s):  
David Emin ◽  
I. A. Howard ◽  
T. A. Green ◽  
C. L. Beckel
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Carbon Atom ◽  
Carbon Content ◽  
Maximal Concentration ◽  
Structural Units ◽  
Coherent Transport ◽  
Dependent Change ◽  
Compositional Changes ◽  
Microscopic Origin

ABSTRACTLarge grain polycrystalline boron carbides have a high-temperature thermal conductivity which changes from being characteristic of a crystal to being glass-like as the carbon content is reduced from its maximal value. We relate this phenomenon, to compositional changes within the three-atom intericosahedral chains. With a reduction of the carbon concentration from its maximal concentration (20 %), a carbon atom within some of the three-atom (CBC) intericosahedral chains is replaced by a boron atom, thereby producing CBB chains. We estimate that the CBB chains are significantly softer than the CBC chains. Thus, with this reduction of carbon content the intericosahedral chains are inhomogeneously softened. This suppresses the coherent transport of heat through the chains. The remaining thermal transport occurs incoherently through vibrationally inequivalent structural units, i.e. “phonon hopping.”

HARDNESS AND THERMAL CONDUCTIVITY OF As-Se-Te CHALCOGENIDE GLASSES

1981 ◽  
Vol 42 (C4) ◽  
pp. C4-931-C4-934 ◽  
Author(s):  
M. F. Kotkata ◽  
M.B. El-den
Keyword(s):  
Thermal Conductivity ◽  
Chalcogenide Glasses

A STUDY OF THE Pb PRECIPITATION IN NaCl FROM THERMAL CONDUCTIVITY EXPERIMENTS

1981 ◽  
Vol 42 (C6) ◽  
pp. C6-893-C6-895
Author(s):  
M. Locatelli ◽  
R. Suchail ◽  
E. Zecchi
Keyword(s):  
Thermal Conductivity

THEORY OF THERMAL CONDUCTIVITY IN MOLECULAR CRYSTALS, APPLICATION TO ALCALI CYANIDES

1981 ◽  
Vol 42 (C6) ◽  
pp. C6-247-C6-249 ◽  
Author(s):  
W. Bauernfeind ◽  
J. Keller ◽  
U. Schröder
Keyword(s):  
Thermal Conductivity ◽  
Molecular Crystals
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