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A calorimetric investigation of spessartine: Vibrational and magnetic heat capacity |
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| Authors: | Edgar Dachs Charles A Geiger Eric J Essene |
| Institution: | a Fachbereich Materialforschung & Physik, Abteilung Mineralogie, Universität Salzburg, Hellbrunnerstrasse 34, A-5020 Salzburg, Austria b Institut für Geowissenschaften, Abteilung Mineralogie, Christian-Albrechts-Universität Kiel, Olshausenstrasse 40, D-24098 Kiel, Germany c Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA d Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1005, USA |
| Abstract: | The heat capacity (Cp) of two synthetic spessartine samples (Sps) was measured on 20-30 mg-size samples in the temperature range 2-864 K by relaxation calorimetry (RC) and differential scanning calorimetry (DSC). The polycrystalline spessartine samples were synthesized in two different laboratories at high pressures and temperatures from glass and oxide-mixture starting materials and characterized by X-ray powder diffraction and electron-microprobe analysis. The low-temperature heat capacity data show a prominent lambda transition with a peak at 6.2 K, which is interpreted to be the result of a paramagnetic-antiferromagnetic phase transition. The DSC data around ambient T agree excellently with the RC data and can be represented by the Cp polynomial for T > 250 K: |
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