Thermal Conductivity of Dielectric Crystals: The ‘Umklapp’ Process

Nature ◽  
1951 ◽  
Vol 168 (4268) ◽  
pp. 277-280 ◽  
Author(s):  
R. BERMAN ◽  
F. E. SIMON ◽  
J. WILKS
Keyword(s):  
Thermal Conductivity ◽  
Umklapp Process

Thermal conductivity of GaAs/AlAs superlattices: The Umklapp process

2004 ◽  
Vol 13 (12) ◽  
pp. 2109-2114 ◽  
Author(s):  
Yang Yu-Rong ◽  
Yan Xiao-Hong ◽  
Cao Jue-Xian ◽  
Xiao Yang ◽  
Mao Yu-Liang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Umklapp Process

Phonons

Quantum 20/20 ◽  
2019 ◽  
pp. 55-74
Author(s):  
Ian R. Kenyon
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Phonon Scattering ◽  
Phonon Dispersion ◽  
Dispersion Relations ◽  
Quantum Model ◽  
Lattice Structures ◽  
Umklapp Process ◽  
X Ray Scattering ◽  
Temperature Ranges

Phonons are introduced as an example of quasi-particles that can only exist in matter. Debye’s quantum model for heat capacity of solids and comparison with experimentin different temperature ranges is presented. The dispersion relations of lattice vibration (phonons) and quantization for chains of atoms presented, revealing the optical and acoustic modes; anharmonic effects are discussed. Crystal lattice structures and Brillouin zones are introduced. Phonon scattering and the Umklapp process described. The variation of the thermal conductivity of dielectrics with temperature is interpreted. X-ray scattering studies of phonon dispersion relations are described. Coupling between phonons with photons in polaritons is explained: Raman scattering studies of GaN used to exhibit the cross-over of their dispersion relations. The Mössbauer effect, a recoilless process, and its dependence on temperature are explained.

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
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