Disclination Dipoles as the Basic Structural Elements of Dielectric Glasses
V.A. Osipov, S.E. Krasavin
TL;DR
This paper explains the thermal conductivity behavior of dielectric glasses across various temperatures by identifying two key scattering processes involving disclination dipoles and Rayleigh scattering, supporting the cluster model of glasses.
Contribution
It introduces disclination dipoles as fundamental structural elements influencing phonon scattering in dielectric glasses, providing a new perspective on their thermal properties.
Findings
Thermal conductivity explained by two scattering processes
Disclination dipoles significantly impact phonon scattering
Supports the cluster model of glass structure
Abstract
We show that the experimentally observed behavior of thermal conductivity of dielectric glasses over a wide temperature range can be explained by a combination of two scattering processes. The first one comes from the phonon scattering due to biaxial dipoles of wedge disclinations while the second one is the Rayleigh type scattering. The results obtained support the cluster picture suggested earlier for glassy materials.
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