Brillouin scattering in single crystals of β-nitrogen: Determination of the elastic constants in the triple point

Abstract

The technique of high resolution Brillouin spectroscopy has been used to determine the adiabatic elastic constants of oriented single crystals of β‐nitrogen at temperatures near the triple point (63.15 K). The values obtained were c₁₁=1.8(25), c₁₂=1.1(31), c₄₄=0.32(0), c₃₃=1.9(76), and c₁₃=0.9(80) (in units of 10¹⁰ dyn cm⁻²) with an estimated uncertainty of ±2%. These results indicate that crystals of β‐nitrogen are close to being elastically isotropic.