Thermodynamic Properties of AlNd Determined by Low Temperature Heat Capacity Measurements

Abstract

The thermodynamic properties of AlNd were investigated by measuring the heat capacity, Cp, from near absolute zero (2 K) to 300 K using the relaxation method. During the measurement of the Cp(AlNd), 4 thermal anomalies were found on the Cp curve at 75.34, 39.79, 25.77, and 6.95 K. The third law entropy of AlNd at 298 K was obtained by integrating the polynomials for the measured Cp values. The result was as follows: S 298 (AlNd)/J·K -1 ·mol -1 = 93.72 ± 0.47. Using this value, the standard entropy of formation at 298 K was obtained as follows: Δ f S° 298 (AlNd)/J·K -1 ·mol -1 = -6.18±0.94.