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

Auteur(s): Jimenez-Rioboo Rafael J., Artus Lluis, Cusco R., Taniguchi Takashi, Cassabois G.(Corresp.), Gil B.(Corresp.)

(Article) Publié: Applied Physics Letters, vol. 112 p.051905 (2018)
Texte intégral en Openaccess : openaccess


Ref HAL: hal-01697455_v1
DOI: 10.1063/1.5019629
WoS: 000424053600017
Exporter : BibTex | endNote
6 Citations
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.