Heat Capacities of CrF3 and CrCl3 from 15 to 300°K

Abstract

The heat capacities of CrF₃ and CrCl₃ have been measured over the temperature range from 15 to 300°K. CrF₃ has two peaks; the upper peak has its maximum at 69.8°K and is associated with a known magnetic transition. The lower peak has its maximum at 45.6°K and has not been correlated with magnetic phenomena. The total magnetic entropy is divided almost equally between the two. CrCl₃ has a single peak at 16.8°K which is associated with a ferromagnetic transition. For CrF₃, S_298.15⁰=22.44 eu; for CrCl₃, S_298.15⁰=29.38 eu. Other thermodynamic functions are tabulated.