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Figure 1
Schematic drawings of high-pressure XRD experiments in DACs with different geometries. (a) Axial geometry adopted for FeBO3 scXRD with Ne as PTM and for FeH pXRD with H2 as PTM. (b) Radial geometry employed for laser-heated GeO2 pXRD in a bevel DAC without PTM. (c) Axial geometry for the t-DAC experiment (ultrahigh-pressure pXRD experiments on Fe with MgO and Au with Ne). Inserts in the lower left corners indicate the gasket assembly as viewed along the DAC compression axis: the sample chamber is shown as a white circle; the white dashed line shown in the insert (b) indicates a slot in the Kapton foil, making it easier to remove Kapton after the gasket fixation by the diamond anvils. The materials of the gasket assembly and the sample are colour coded as shown at the bottom: light grey, dark grey, orange and green correspond to Re, Fe0.79Si0.07B0.14 metallic glass, Kapton and the sample, respectively. BS is the beam stop and DET indicates the position of a detector.

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