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Article Dans Une Revue Applied Physics Letters Année : 2018

In- and out-of-plane longitudinal acoustic-wave velocities and elastic moduli in h-BN from Brillouin scattering measurements

Résumé

The elastic constants of high-quality, single-crystal hexagonal boron nitride (h-BN) have been measured by means of high resolution Brillouin spectroscopy using a modified reflected light microscope. The sound propagation velocity in the c-axis direction and perpendicular to the c-axis have been obtained from the Brillouin frequency shift, with a proper account taken of the vast difference between the ordinary and extraordinary refractive indices recently reported in the highly anisotropic layered h-BN crystal. The elastic constants c11 and c33 obtained from the Brillouin experiments are somewhat lower than previous determinations based on inelastic x-ray measurements and confirm the overestimation of the h-BN elastic constants by ab initio calculations based on density functional perturbation theory in the local density approximation.
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Dates et versions

hal-01697455 , version 1 (25-05-2021)

Identifiants

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Rafael J. Jimenez-Rioboo, Lluis Artus, R. Cusco, Takashi Taniguchi, Guillaume Cassabois, et al.. In- and out-of-plane longitudinal acoustic-wave velocities and elastic moduli in h-BN from Brillouin scattering measurements. Applied Physics Letters, 2018, 112, pp.051905. ⟨10.1063/1.5019629⟩. ⟨hal-01697455⟩
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