Restudy of Grüneisen Parameter of Iron in the Pressure Range of 90－160 Gpa

• 来源期刊: 中国物理快报(英文版)
• 学科: 物理学
• 年，卷（期）: 2001,（1）
• 页码范围: 85-87
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

The Hugoniot equation-of-state (EOS) of porous iron with an average initial density of 6.904g/cma3 has been measured in the pressure range from 90 to 160GPa, and a good straight fitting D ＝ 2.997 + 1.603u has accordingly been obtained, where D is the shock wave velocity and u the particle velocity, both in units of km/s. Combining this with the Hugoniot EOS of non-porous iron, the Grüneisen EOS and the Rankine-Hugoniot energy conservation relation, and taking the possible solid-liquid transition correction, we have calculated the Grüneisen parameter γ of iron and obtained the result γ0ρ0 ＝ γρ ＝const, with γ0 ＝ 1.945 and ρ0 ＝ 7.856g/cm3, ρ being the density.