Fig. 3: Phonon dispersion curves and the schematics of vibrational modes.
From: Giant uniaxial negative thermal expansion in FeZr2 alloy over a wide temperature range
a, b Phonon dispersion curves for FeZr2 (a) and NiZr2 (b), with the size of the dots corresponding to the magnitude of γc; the blue indicates negative γc and the red indicates positive γc. c Representative phonon modes contribute to the four most negative γc at each high-symmetry point (the green dot in (a)) for FeZr2.
