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Thermodynamic properties of uvarovite garnet (Ca₃Cr₂Si₃O₁₂)

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
³ European Commission, Joint Research Centre, Institute for Transuranium Elements (ITU), Postfach 2340, 76125 Karlsruhe, Germany
⁴ Charles University, Faculty of Mathematics and Physics, Department of Electronic Structures, Ke Karlovu 5, 12116 Prague 2, The Czech Republic

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

The low-temperature heat capacity of uvarovite (Ca₃Cr₂Si₃O₁₂) was measured between 2 and 400 K, and thermochemical functions were derived from the results. The measured heat-capacity curve shows a significant lambda-shaped anomaly peaking at around 9 K. The nature of this transition is unknown. From our data, we suggest a standard entropy for uvarovite at 298.15 K of 320.9 ± 0.6 J/(mol·K).