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Figure 1

From: Non-destructive analysis of a mixed H2O–CO2 fluid in experimental noble-metal capsule by means of freezing and high-energy synchrotron X-ray diffraction

Figure 1

Experimental and analytical setup. (a) Sketch of the experimental capsule, consisting of an outer gold capsule containing an fH2–fO2 buffering assemblage (FMQ = fayalite + magnetite + quartz + water) and an inner gold–palladium capsule (brown thick line), permeable to hydrogen, containing graphite + water. At run conditions of 1 GPa, 800 °C and fH2FMQ, the oxidation of graphite produces CO2. (b) The inner gold–palladium capsule containing graphite and a mixed H2O–CO2 fluid is mounted on a goniometer head and cooled down to − 180 °C to allow the fluid to freeze into solid phases; X-ray diffraction effects inside the noble-metal capsule are collected using a high-energy 77 keV synchrotron source at ID15A of the ESRF. (c) Back-scattered electron image of a cross section of the inner capsule (white), mounted in epoxy resin and polished after synchrotron and QMS measurements; the former presence of a fluid phase can be inferred from the porosity between the graphite grains.

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