Grüneisen’s law according to which the temperature dependence of the lattice specific heat at constant volume is similar to that of the thermal expansion coefficient is checked experimentally for the icosahedral phase of Al63Cu25Fe12. The specific heat CP(T) and linear thermal expansion coefficient αL(T) are measured in the temperature interval 1.8400K. It is found that Grüneisen’s law holds quite satisfactorily in the temperature range 200400K. Significant deviations from this law are found at lower temperatures. These deviations are due to the presence of “excess” specific heat of the Schottky anomaly type. It is shown that this contribution is of electronic origin.

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