Abstract
Peculiarities in the transport characteristics of thermal-frequency phonons are analyzed in the region of transition to the thermal conductivity plateau in fused quartz, F-1 glass, glassed based on pentaphosphates of rare-earth metals, and a number of ferroelectrics (relaxors). It is shown that the formation of the plateau region in the temperature dependence of thermal conductivity at T < 10 K for these materials can be associated with the occurrence of a gap in the spectrum of phonon states.
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