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Figure 2
Schematic view of the sample assembly. (Right) The sample is contained in a diamond cylinder of internal and external diameters 0.5 and 1.5 mm, respectively. The capsule is sealed by a platinum disk and a sodium chloride pellet and encapsulated in a hexagonal boron nitride cylinder acting as the pressure-transmitting medium. It is then placed in a graphite heater. (Left) The assembly is placed in a boron ep­oxy gasket. A molybdenum disk and ring ensure optimal electrical contact for the generation of high temperature. Finally, the assembly is placed in a PEEK ring to avoid extrusion (not represented).

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