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The heat capacity of synthetic eskolaite, Cr 2 O 3 , and of the synthetic spinels magnesiochromite, MgCr 2 O 4 , and chromite, FeCr 2 O 4  were measured from 1.5 K to 340 K. For MgCr 2 O 4 , a substantial magnetic contribution to the entropy is revealed by a sharp peak in the heat capacity curve at 12.55 ± 0.05 K, which indicates the transition to antiferromagnetic long-range order. Integration of the heat capacity curve yields a value of 118.3 ± 1.2 J/(mol·K) for the standard entropy at 298.15 K, which is in excellent agreement with that calculated from phase equilibria studies on the reaction MgCr 2 O 4 + SiO 2  = Cr 2 O 3  + MgSiO 3 . The new calorimetric results for Cr 2 O 3  indicate a standard entropy at 298.15 K of 82.8 ± 0.8 J/(mol·K). The measurements for FeCr 2 O 4  show three distinct heat capacity anomalies, one of which (peaking at 36.5 ± 0.2 K) was missed by previous low temperature heat capacity measurements, which only extend down to 53 K. Integration of the heat capacity curve yields a value for the standard entropy at 298.15 K of 152.2 ± 3.0 J/(mol·K) for FeCrO 4 , some 6 J/ (mol·K) greater than the previous calorimetric value.

The heat capacity of MgCr 2 O 4 , FeCr 2 O 4 , and Cr 2 O 3 at low temperatures and derived thermodynamic properties