Comment on “Structural, electronic, elastic, optical and thermodynamic properties of copper halides CuCl, CuBr and their ternary alloys CuCl1−xBrx (0.0 ≤ x ≤ 1.0) using full-potential linear muffin-tin orbital (FP-LMTO) method”[Optik 127 (2016)

In the present work, I recalculate the correct numerical values of the longitudinal (vl), transverse (vt) and average (vm) wave velocities, and the Debye temperature θD, of CuX (X = Cl, Br) compounds, using the lattice parameters and the elastic moduli obtained in the original work of Kamel et al. (2016) [1].