THERMODYNAMIC PROPERTIES OF NICKEL CHROMITE (NICR2O4) BASED ON ADIABATIC CALORIMETRY AT LOW TEMPERATURES

Abstract

The hitherto unknown low-temperature heat capacity of nickel chromite (NiCr2O4) was measured between 8 and 381 K using adiabatic calorimetry, and some thermochemical functions [CP(T), S(T), S°298, H(T)-H(0)] were derived from the results. The standard entropy (S°298=140.0 ± 0.3 J mol-1 K-1) for nickel chromite was calculated from the results. Our calorimetric measurements indicate three major anomalies in the heat-capacity curve at temperatures between 8 and 381 K. A short literature review indicates that two of these anomalies can be accounted for, whereas an anomaly peaking at 29 K has not been reported previously.