南丹铁陨石冲击绝热线和状态方程的研究

Studies on the Shock Adiabatics and Equation-of-State of Nandan Iron Meteorite

1.
Institute of Applied Physics, Chengdu University of Science and Technology, Chengdu 610065, China;
2.
Southwest Institute of Fluid Physics, Chengdu 610003, China

摘要: 用二级轻气炮作为加载工具，对南丹铁陨石进行了冲击压缩线测量，压力范围为62~208 GPa。用阻抗匹配法得出的南丹铁陨石冲击波速度D与粒子速度u之间的关系为：D=3.884+1.840u-0.12267u2（km/s），还据此确定了考虑到晶格非谐振项贡献的南丹铁陨石的三项式Grneisen状态方程。
- 铁陨石 /
- 冲击压缩线 /
- 状态方程
Abstract: The shock adiabatic of Nandan iron meteorite was measured by using impedance-match method and a two-stage light-gas gun as its loading tool. Pressure ranges are from 62 GPa to 208 GPa. The shock velocity D versus particle velocity u can be expressed as D=3.884+1.840u-0.12267u2 (km/s). With the assumptions of Born-Meyer potential suitable interatomic potential and the thermal contributions necessitating inclusions of non-harmonic vibration term and free-electron term, the equation-of-state of Nandan iron meteorite is also deduced in this paper.
- iron meteorite /
- shock adiabatics /
- equation-of-state