The heat capacities and thermodynamic properties of NiAl2O4 and CoAl2O4 measured by adiabatic calorimetry from T = (4 to 400) K |
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| Authors: | S Klemme JC van Miltenburg |
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| Institution: | 1. Institut für Mineralogie, Westfälische Wilhelms Universität, Corrensstrasse 24, D-48149 Münster, Germany;2. Chemical Thermodynamics Group, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands |
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| Abstract: | The low-temperature heat capacity of NiAl2O4 and CoAl2O4 was measured between T = (4 and 400) K and thermodynamic functions were derived from the results. The measured heat-capacity curves show sharp anomalies peaking at around T = 7.5 K for NiAl2O4 and at T = 9 K for CoAl2O4. The exact cause of these anomalies is unknown. From our results, we suggest a standard entropy for NiAl2O4 at T = 298.15 K of (97.1 ± 0.2) J · mol?1 · K?1 and for CoAl2O4 of (100.3 ± 0.2) J · mol?1 · K?1. |
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