Physical Properties of Group 14 in $P6_{2}$22 Phase: First-Principles Calculations *

Ying-Bo Zhao,Wei Zhang,Qing-Yang Fan

Table 4 The Debye temperature ($\mathit\Theta_{D}$ in K), and the longitudinal, transverse, mean sound velocity ($v_{l}$, $v_{t}$, and $v_{m}$ in m/s) of $C_{3}$, $Si_{3}$, and $Ge_{3}$ in $P6_{2}$22 phase.