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In-situ x-ray diffraction patterns of Ge1Sb2Te4 upon compression (left) and decompression (right) in the pressure range of 0-36 GPa at ambient temperature. Inset: Relative fraction of the bcc phase as a function of pressure upon compression and decompression.
Experimental (blue) and RMC simulated (red) structure factors S(Q) (left) and corresponding Fourier transformed radial distribution functions G(r) (right) of amorphous Ge1Sb2Te4 upon compression. Inset: Pressure dependence of the position of the principal peak in S(Q). Solid black lines show the linear least squares fits through data points in the low and high pressure regimes.
Pressure dependence of the nearest neighbor coordination numbers for Ge (black square), Sb (red circles), and Te (blue triangles) atoms in amorphous Ge1Sb2Te4 during compression as obtained from RMC simulations. Solid lines are linear least squares fits through the data points in the low and high pressure regimes. Grey shaded area demarcates the pressure range across, which the polyamorphic transition between low-pressure LDA and high-pressure HDA phases takes place.
Pressure dependence of densities of the LDA and HDA phases (solid circles) and of the bcc phase (solid triangles). Solid straight lines are the linear least squares fits through the data points for the three phases.
Atomic number densities and nearest-approach distances used in RMC simulations.
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