Calorimetric study of AlNd2: Heat capacity. Standard Gibbs energy of formation

The thermodynamic properties of the magnetic phase transition from ferro- to para-phases of AlNd2 were directly investigated by using calorimetry. The standard entropies of formation, image, of the ferro- and paramagnetic phases were determined by measuring the heat capacity, image, from 2 to 300 K. The standard enthalpies of formation, image, of them were determined by combining image with the standard enthalpy of formation, image, at 298 K obtained by acid solution calorimetry. The standard Gibbs energies of formation, image, of the ferro- and paramagnetic phases of AlNd2 were determined from their image and image values. The image values indicate that the magnetic phase transition from ferro- to paramagnetic phases occurs at 39.59 K, consistent with the observed phase transition at 39.59 K.