A calorimetric study of biotite solid solutions



Solid-solution compositions for these binaries will be synthesized at elevated pressures and temperatures and then characterized using standard analytical techniques (i.e., X-ray diffraction, scanning electron microscopy with quantitative EDX analysis, Mössbauer spectroscopy, optical microscopy). The synthetic biotites will then be studied by: 1) Relaxation calorimetry, i.e. low-temperature heat capacity measurements between 2 K and 300 K using a Physical Properties Measurements System, 2) Differential scanning calorimetry, i.e. heat capacity measurements between 280 K and 760 K, 3) Infrared spectroscopy, and 4) Ab-initio calculations, i.e. density functional theory (DFT) calculations for selected biotite compositions.

Despite the importance of biotite in various metamorphic and magmatic processes, a calorimetric-based thermodynamic description of biotite is lacking.
In order to rectify this deficiency, it is proposed to investigate the thermodynamic mixing behavior of four biotite solid-solutions, namely the binaries annite-phlogopite, annite-siderophyllite, phlogopite-eastonite and annite-eastonite.
Tatsächlicher Beginn/ -es Ende1/01/1631/12/20

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