Abstract
The temperature dependence of the thermal conductivity (T) of single crystals isotopically enriched 70Ge (99.926%), 72Ge (99.980%), 74Ge (99.921%) has been measured in the temperature range 80–310K. In the studied temperature range, the thermal conductivity is determined by anharmonic processes of phonon scattering; a decrease in the thermal conductivity with increasing mass of the germanium isotope is experimentally observed.
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