Lattice thermal conductivity and phonon-dislocation interaction in niobium and tantalum single crystals plastically deformed at intermediate temperatures

1985 ◽  
Vol 52 (2) ◽  
pp. 225-241 ◽  
Author(s):  
W. Wasserbäch
Keyword(s):  
Thermal Conductivity ◽  
Single Crystals ◽  
Lattice Thermal Conductivity ◽  
Dislocation Interaction

scholarly journals Dimer rattling mode induced low thermal conductivity in an excellent acoustic conductor

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ji Qi ◽  
Baojuan Dong ◽  
Zhe Zhang ◽  
Zhao Zhang ◽  
Yanna Chen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Single Crystals ◽  
Layered Structure ◽  
First Principles ◽  
Sound Speed ◽  
Lattice Dynamics ◽  
Room Temperature ◽  
Lattice Thermal Conductivity ◽  
Atomic Structures ◽  
Order Of Magnitude

Abstract A solid with larger sound speeds usually exhibits higher lattice thermal conductivity. Here, we report an exception that CuP2 has a quite large mean sound speed of 4155 m s−1, comparable to GaAs, but single crystals show very low lattice thermal conductivity of about 4 W m−1 K−1 at room temperature, one order of magnitude smaller than GaAs. To understand such a puzzling thermal transport behavior, we have thoroughly investigated the atomic structures and lattice dynamics by combining neutron scattering techniques with first-principles simulations. This compound crystallizes in a layered structure where Cu atoms forming dimers are sandwiched in between P atomic networks. In this work, we reveal that Cu atomic dimers vibrate as a rattling mode with frequency around 11 meV, which is manifested to be remarkably anharmonic and strongly scatters acoustic phonons to achieve the low lattice thermal conductivity.

Ultralow cross-plane lattice thermal conductivity caused by Bi–O/Bi–O interfaces in natural superlattice-like single crystals

CrystEngComm ◽  
2019 ◽  
Vol 21 (41) ◽  
pp. 6261-6268
Author(s):  
Chen Di ◽  
Jia-Hui Pan ◽  
Song-Tao Dong ◽  
Yang-Yang Lv ◽  
Xue-Jun Yan ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Single Crystals ◽  
Lattice Thermal Conductivity ◽  
Van Der Waals ◽  
Van Der Waals Interactions ◽  
Plane Lattice ◽  
Natural Superlattice ◽  
The Impact

Revealing the impact of Bi–O/Bi–O interfaces with van der Waals interactions on the formation of ultralow cross-plane lattice thermal conductivity.

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