Fig. 4

The phonon dispersion curves of \(\hbox {ZrCr}_2\) and its Na-alloyed along high-symmetry directions in the Brillouin zone for (a): \(\hbox {ZrCr}_2\) and (b): \(\hbox {ZrNa}_{0.5}\hbox {Cr}_{1.5}\).

The phonon dispersion curves of \(\hbox {ZrCr}_2\) and its Na-alloyed along high-symmetry directions in the Brillouin zone for (a): \(\hbox {ZrCr}_2\) and (b): \(\hbox {ZrNa}_{0.5}\hbox {Cr}_{1.5}\).