THERMODYNAMIC PROPERTIES OF HERCYNITE (FEAL2O4) BASED ON ADIABATIC CALORIMETRY AT LOW TEMPERATURES

Abstract

The low-temperature heat capacity of hercynite (FeAl2O4) was measured between 3 and 400 K. and thermochemical functions were derived from the results. The measured heat-capacity curve shows a small lambda-shaped anomaly peaking at around 13 K. From our data, we suggest a standard entropy for hercynite at 298.15 K of 113.9 ± 0.2 J/(mol·K), which is some 7.6 J/(mol·K) higher than reported previously by calorimetric study that missed the entropy contributions of the low-temperature anomaly.