Thermodynamic properties of nickel chromite (NiCr2O4) based on adiabatic calorimetry at low temperatures |
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| Authors: | S Klemme J C van Miltenburg |
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| Institution: | Mineralogisches Institut, Universit?t Heidelberg, Im Neuenheimer Feld 236, 69120 Heidelberg, Germany email: sklemme@min.uni-heidelberg.de, DE
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| 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. |
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