Acoustic phonons in chrysotile asbestos probed by high-resolution inelastic x-ray scattering

摘要

Acoustic phonons in an individual, oriented fiber of chrysotile asbestos (chemical formula Mg3Si2O5 (OH)(4)) were observed at room temperature in the inelastic x-ray measurement with a very high (meV) re solution. The x-ray scattering vector was aligned along 100 direction of the reciprocal lattice, nearly parallel to the long axis of the fiber. The latter coincides with 100 direction of the direct lattice and the axes of the nano-channels. The data were analyzed using a damped harmonic oscillator model. Analysis of the phonon dispersion in the first Brillouin zone yielded the longitudinal sound velocity of (9200 +/- 600) m/s.