Thermodynamic and magnetic properties of knorringite garnet (Mg3Cr2Si3O12) based on low-temperature calorimetry and magnetic susceptibility measurements |
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| Authors: | C H Wijbrans O Niehaus A Rohrbach R Pöttgen S Klemme |
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| Institution: | 1. Institut für Mineralogie, Westf?lische Wilhelms-Universit?t, Corrensstra?e 24, 48149, Münster, Germany
2. Institut für Anorganische und Analytische Chemie, Westf?lische Wilhelms-Universit?t, Corrensstra?e 30, 48149, Münster, Germany
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| Abstract: | The low-temperature heat capacity of knorringite garnet (Mg3Cr2Si3O12) was measured between 2 and 300 K, and thermochemical functions were derived from the results. The measured heat capacity curves show a sharp lambda-shaped anomaly peaking at around 5.1 K. Magnetic susceptibility data show that the transition is caused by antiferromagnetic ordering. From the C p data, we suggest a standard entropy (298.15 K) of 301 ± 2.5 J mol?1 K?1 for Mg3Cr2Si3O12. The new data are also used in conjunction with previous experimental results to constrain ?H f ° for knorringite. |
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