Fig. 1
From: Ultrahigh-pressure acoustic wave velocities of SiO2-Al2O3 glasses up to 200 GPa
a Total structure factors S(Q) and b radial distribution functions of SA1 and SA2. The first neighbor T-O (T = Si, Al) lengths in SA1 and SA2 were 1.62 and 1.65 Å, respectively. The measurements were carried out in step-scanning mode with 0.05°/2θ in the range 0.3° < 2θ < 10.0°, 0.10°/2θ in the range 10.0° < 2θ < 19.9°, 0.15°/2θ in the range 19.9° < 2θ < 40.0°, and 0.20°/2θ in the range 40.0° < 2θ < 58.0° in transmission geometry. Incident X-ray energy was 61.55 keV and scattering vector (Q) changes were from 0.2 Å−1 to 30.2 Å−1