Elastic properties of icosahedral i-Cd84Yb16 and hexagonal h-Cd51Yb14

The elastic constants, their temperature and pressure derivatives, and coefficients of thermal expansion of the icosahedral quasicrystal i-Cd84Yb16and of the hexagonal phaseh-Cd51Yb14 have been studied by resonant ultrasound spectroscopy, conventional ultrasonic resonance techniques and dilatometry, respectively. The elastic properties of both phases are very similar although they are structurally not related. Contrary to the assumption often found in quasicrystal literature, the similarity of particular physical properties is not necessarily an indication for structural similarity. Further, a first-order phase transition at about 111 K has been observed in h-Cd51Yb14 as indicated by a reversible discontinuity in the thermal expansion.

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