Heat capacity and entropy of monoclinic Gd2O3

The heat capacity of monoclinic gadolinium sesquioxide was measured by adiabatic calorimetry in the temperature range (4 to 380) K. The results are compared to published results for cubic Gd2O3, indicating small differences, which result in a significantly higher standard entropy at T = 298.15 K. The systematics in the standard entropies of the lanthanide and actinide sesquioxide series are discussed.