Fig. 3
From: The effect of Fe incorporation on the single-crystal elasticity of δ-AlOOH
Results from Brillouin scattering experiments conducted on δ-(Al,Fe)OOH at ambient conditions. In (a, b), representative Brillouin spectra collected on Fe6 and Fe13 samples, respectively, are shown; spectral features belong to the sample compressional (vP), fast shear (vS1) and slow shear (vS2) wave velocities, and elastic peak (R). Features in the low-velocity range (< 3 km/s) are unattenuated tails of the elastic peak. The plots on the right show the experimental angular dispersion of compressional (vP), fast shear (vS1), and slow shear (vS2) acoustic wave velocities as a function of the rotation angle. Measured values are plotted as solid symbols, while solid curves are calculated from the best-fit cij determined from experimental data inversion (see “Materials and methods” section)