非晶态BeH₂的高压布里渊散射

High-pressure Brillouin scattering of amorphous BeH2.

作者信息

Ahart Muhtar, Yarger Jeffery L, Lantzky Kristina M, Nakano Satoshi, Mao Ho-Kwang, Hemley Russell J

机构信息

Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Rd., N.W., Washington, DC 20015, USA.

出版信息

J Chem Phys. 2006 Jan 7;124(1):14502. doi: 10.1063/1.2138692.

DOI:10.1063/1.2138692

PMID:16409036

Abstract

High-pressure micro-Brillouin scattering is employed to investigate the pressure dependence of the sound velocity, refractive index, equation of state, and mechanical properties of amorphous BeH2. The refractive index n has been determined by using two scattering geometries (70 degrees and 180 degrees). The equation of state is deduced from the pressure dependences of the sound velocity. The bulk modulus is 14.2 (+/-3.0) GPa and its pressure derivative is 5.3 (+/-0.5). The polarizability is calculated from the refractive index and the density of the material. It increases with pressure while Poisson's ratio decreases with pressure.

摘要

采用高压微布里渊散射研究非晶态BeH₂的声速、折射率、状态方程和力学性能随压力的变化。通过两种散射几何结构（70度和180度）测定了折射率n。根据声速随压力的变化推导出状态方程。体积模量为14.2（±3.0）GPa，其压力导数为5.3（±0.5）。根据材料的折射率和密度计算了极化率。极化率随压力增加，而泊松比随压力降低。