Scattering of phonons by dislocations
By 1950, an explicit effort had been launched to use lattice thermal conductivity measurements in the investigation of defect structures in solids. This technique has been highly successful, especially when combined with the measurements of other properties such as optical absorption. One exception has been the study of dislocations. Although dislocations have a profound effect on the phonon thermal conductivity, the mechanisms of the phonon-dislocation interaction are poorly understood. The most basic questions are still debated in the literature. It therefore is pointless to attempt a quantitative comparison between an extensive accumulation of experimental data on the one hand, and the numerous theoretical models on the other. Instead, this chapter will attempt to glean a few qualitative conclusions from the existing experimental data. These results will then be compared with two general models which incorporate, in a qualitative manner, most of the proposed theories of the phonon-dislocation interaction. Until very recently, measurement of thermal conductivity was the only means available to probe the interaction between phonons and defects at phonon frequencies above the standard ultrasonic range of approx. = 10/sup 9/ Hz. The introductory paragraphs provide a brief review of the thermal-conductivity technique and the problems which are encountered in practice. There is also a brief presentation of the theoretical models and the complications that may occur in more realistic situations.
- Research Organization:
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 5385265
- Report Number(s):
- DOE/ER/01198-1301; TRN: 80-008259
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL LATTICES
PHONONS
SCATTERING
ALUMINIUM
BISMUTH
COPPER
CRYSTAL DEFECTS
DISLOCATIONS
IONIC CRYSTALS
LEAD
LITHIUM FLUORIDES
NIOBIUM
TANTALUM
THERMAL CONDUCTIVITY
ALKALI METAL COMPOUNDS
CRYSTAL STRUCTURE
CRYSTALS
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LINE DEFECTS
LITHIUM COMPOUNDS
LITHIUM HALIDES
METALS
PHYSICAL PROPERTIES
QUASI PARTICLES
REFRACTORY METALS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
656000* - Condensed Matter Physics