The study of phonon thermal conductivity of CoSi-CoGe solid solutions using ab initio lattice dynamics

Lattice thermal conductivity of solid solutions based on cobalt monosilicide and monogermanide was studied. Electrical conductivities CoSi CoGe x Si 1-x (x=0.03 0.07) were experimentally measured in the temperature range 80-350 K. Phonon spectra calculated using ab initio lattice dynamics. The results calculations are good agreement with measurements obtained present work literature data. It shown that already at a content 10-15 at.% Ge, decreases by about factor 2 compared pure monosilicide, germanium 70 at.%, decrease can reach 3.5 times. Keywords: conductivity, thermoelectrics, first principle