Fig. 3

The Phonon density of states ad function of frequency for (a): \(\hbox {ZrCr}_2\) and (b): \(\hbox {ZrNa}_{0.5}\hbox {Cr}_{1.5}\).

The Phonon density of states ad function of frequency for (a): \(\hbox {ZrCr}_2\) and (b): \(\hbox {ZrNa}_{0.5}\hbox {Cr}_{1.5}\).