Elastic Constants of Ice by Brillouin Spectroscopy

ELASTIC CONSTANTS OF ICE Ih, UP TO 2.8 KBAR, BY BRILLOUIN SPECTROSCOPY

The technique of high resolution Brillouin spectroscopy has been used to determine accurately the hydrostatic pressure dependence of the elastic constants of ice Ih in the full pressure range of phase stability 0 2.8 kbar. The percentage changes in the adiabatic elastic constants c,,, cI2. cI3, cS3, c,, and bulk modulus, over the pressure range, are 3.0, 7.2, 8.4, 2.8, -1.5 and 5.6 percent per ...

The elastic constants and related properties of beta-HMX determined by Brillouin scattering.

By scattering from a variety of acoustic phonons, a complete stiffness tensor has been determined for crystalline beta-HMX. The results are compared with recent experimental and theoretical determinations of the elastic constants and bulk modulus. Reasons for disagreement are discussed in terms of experimental limitations and anharmonic effects. The observed ordering of stiffness constants, C(1...

Elastic constants of tetrahedral amorphous carbon films by surface Brillouin scattering

The elastic constants of tetrahedral amorphous carbon ~ta-C! and hydrogenated tetrahedral amorphous carbon ~ta-C:H! thin films were determined nondestructively by surface Brillouin scattering. Besides the usual Rayleigh surface mode, we also observe a new pseudosurface acoustic mode of longitudinal polarization, which is a modified version of the longitudinal guided mode usually found in slow-o...

Brillouin-scattering study of the elastic constants of phenothiazine through the phase transition.

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