“…Phonon confinement (which reduces phonon group velocity), however, can lead to considerable reductions of LTC in 147 nm Theoritical 147 nm Expt.data [21] 344 nm Theoritical 344 nm Expt.data [21] 229 nm Theoritical 229 nm Expt.data [21] 160 nm Theoritical 160 nm Expt.data [21] Soran Mohammed Mamand: Phonon Scatterings in the Lattice Thermal Conductivity of Si 1-x Ge x Alloy Nanowires: Theoretical Study NWs [25,45]. For the aforementioned sample of Si 1-x Ge x alloy NWs, phonon group velocities are assumed to be sizedependent (as a result of phonon confinement) and calculated using a thermodynamical approach, as used in previous work [44], with all the parameters of Si and Ge available at [46,47]. It is found that the decrease in the phonon group velocities is less than 5.5% of that of the bulk values of the samples, this is because of the relatively large diameter of the samples.…”