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Thermodynamic properties of hercynite (FeAl₂O₄) based on adiabatic calorimetry at low temperatures

¹ Mineralogisches Institut, Universität Heidelberg, Im Neuenheimer Feld 236, 69120 Heidelberg, Germany
² Chemical Thermodynamics Group, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands

Correspondence: ^* E-mail: sklemme{at}min.uni-heidelberg.de

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 a calorimetric study that missed the entropy contributions of the low-temperature anomaly.

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