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(A) Schematics of the sample loading. (B) Sample containment using single-crystal sapphire. (Left) Disk before loading. The disk is 10 μm thick, with a cavity 18 μm in diameter and 6 μm deep machined with FIBM. The iron sample with the same dimensions is laser-cut from a foil. (Center) Picture in transmitted light taken at 24 GPa before heating. The capsule shows no sign of cracks. (Right) Picture taken at 100 GPa after three heating/melting events.
