Low temperature heat capacity and thermodynamic functions of Zr _0.55Al_0.10Ni_0.05Cu_0.30

The heat capacity of Zr0.55Al0.10Ni0.05Cu0.30 alloy was measured for as-prepared glassy, annealed, and crystallized ribbon samples by adiabatic calorimetry from (13 to 300) K. The smoothed values of molar heat capacity were calculated from the data on the basis of a least-squares method. The standard enthalpy, entropy, and Gibbs energy were calculated from the smoothed heat capacity values, and the numerical values of the as-prepared glassy and crystallized samples were tabulated at selected temperatures from (15 to 300) K. The heat capacity, enthalpy, and entropy of the as-prepared glassy ribbon sample at 298.15 K are 25.07 J ·K-1 · mol-1, 5.261 kJ · mol-1, and 36.80 J ·K-1 · mol-1, respectively, assuming H(0) ) 0 and S(0) ) 0 at 0 K. The corresponding values of the crystallized (heated at 877 K for 30 min in a vacuum) ribbon sample are 24.59 J ·K-1 · mol-1, 5.190 kJ · mol-1, and 36.07 J ·K-1 · mol-1, and the Gibbs energy of the crystallized sample is -5.565 kJ · mol-1. The heat capacity of the glassy samples annealed at 508 K and at 641 K in a vacuum is also reported and compared with those of the as-prepared glassy and crystallized samples.