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Published online by Cambridge University Press: 22 February 2011
The set of acoustic mode frequencies associated with elastic constants has been determined from Brillouin light scattering measurements on carbon films of different crystallographic phases, i.e. on chemical vapour deposited (CVD) polycrystalline diamond, polycrystalline graphite, and amorphous carbon films (a-C:H). From the measured sound velocities of the acoustic phonons Young's moduli, shear moduli, and bulk moduli of the films were calculated. On a-C:H films depth-sensing indentation tests were performed. The values of ultramicrohardness of these films are, therefore, also reported.