水绿矾的状态方程和高压熔化

龚自正; ANDERSONW W W; 毕延; 经福谦; 霍卉; 谭华

doi:10.11858/gywlxb.2000.01.011

水绿矾的状态方程和高压熔化

doi: 10.11858/gywlxb.2000.01.011

1.
中国科学院地球化学研究所地球深部物质实验室，贵州贵阳 550002；
2.
中物院流体物理研究所冲击波物理与爆轰物理实验室，四川绵阳 621900；
3.
Department of Geology and Physics Georgia Southwestern State University, Americus, GA31700

详细信息

通讯作者:
龚自正

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出版历程
- 收稿日期: 1999-04-20
- 修回日期: 1999-05-31
- 发布日期: 2000-03-05

Shock Wave Equation of State and Shock-Induced Melting of Melanterite

1.
Material Laboratory of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2.
Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Mianyang 621900, China;
3.
Department of Geology and Physics Georgia Southwestern State University, Americus, GA31700

More Information

Corresponding author: GONG Zi-Zheng

摘要

摘要: 用阻抗匹配法和压电探针技术测量了初始密度为1.714 g/cm3（孔隙率=0/00=1.898/1.714=1.107）的水绿矾（FeSO47H2O）的冲击压缩线，发现其在0～100 GPa范围内存在两个明显相区：含有部分熔融的低压相和完全熔化的高压相。在两个相区内，冲击波速度D和波后粒子速度u可分别描述为：D=0.59+2.06u（u3.12 km/s）和D=3.18+1.223u（u3.12 km/s）。从冲击压缩数据出发，用欧拉有限应变理论得到了其等熵状态方程。其熔化方程可用pm(GPa) =0.159(Tm(K)/1000)6.3371+0.69来近似描述。
- 水绿矾 /
- 冲击压缩 /
- 状态方程 /
- 高压熔化 /
- 外地核
Abstract: Shock compression experiments were conducted on melanterite samples with an initial density of 1.714 g/cm3 up to 100 GPa. The experimental data can be divided into a low-pressure region consisting of a partially molten state, and a completely liquid state at high-pressure. The shock velocity D is a linear function of the particle velocity u in these two regimes: D=0.59+2.06u for u3.12 km/s and D=3.18+1.223u for u3.12 km/s. K0S and K0S, the zero pressure adiabatic bulk modulus and its first pressure derivative of Birch-Murnaghan EOS (isentrope), are obtained in terms of shock Hugoniot data by using the Eulerian finite strain theory. Under the assumption =3.12(0/), then for the low pressure phase (0=1.898 g/cm3), K0S=3.72 GPa and K0S=4. We find 0=1.60 g/cm3, K0S=3.28 GPa and K0S=10.5 for the high pressure phase (liquid state), with a STP melting energy of 80 J/g and =1.46(0/). The melting curve of melanterite is determined according to Lindemann's law and can be approximately described as: pm(GPa) =0.159(Tm(K)/1000)6.3371+0.69.
- melanterite /
- shock compression /
- EOS /
- melting /
- the earth's outer core

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参考文献(18)

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