铁高压熔化线的测量熔化机理的影响

李西军; 龚自正; 刘福生; 蔡灵仓; 经福谦

doi:10.11858/gywlxb.2001.03.009

铁高压熔化线的测量熔化机理的影响

doi: 10.11858/gywlxb.2001.03.009

1.
中物院电子工程研究所基础研究中心，四川绵阳 621900；
2.
西南交通大学高温高压物理研究所，四川成都 610036；
3.
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

详细信息

通讯作者:
李西军

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出版历程
- 收稿日期: 2000-12-04
- 修回日期: 2001-02-22
- 发布日期: 2001-09-05

A Problem in Measurements of High Pressure Melting Curve of Iron: Influence of Melting Mechanism on the Melting Temperature

1.
Institute of Electronic Engineering, CAEP, Mianyang 621900, China;
2.
Institute of High Temperature and High Pressure Physics, Southwest Jiaotong University, Chengdu 610036, China;
3.
Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Mianyang 621900, China

More Information

Corresponding author: LI Xi-Jun

摘要

摘要: 铁的高压熔化线是高压物理和地球物理研究领域的一个重要课题。就目前的研究成果来看，存在一个公认的问题：静高压实验测得的熔化温度系统地低于来自动态加载实验的熔化数据在核-幔边界压力下（330 GPa），动压数据比静压数据高了近一倍（3 000 K）。从熔化相变的物理理论出发，对目前铁高压熔化线实验研究中的实验手段进行评述，并应用有关熔化相变理论的研究成果，对这一重要而未澄清的事实进行初步的探讨。结果表明：在目前铁高压熔化线的实验研究中，计及预熔化和冲击过热在静压和动压实验中对铁熔化温度的影响，可以得到相对自洽的实验结果。这一结果表明，地球核-幔边界压力下铁的熔化温度为3 850 K，外推可以得到铁在内核-外核边界压力下的熔化温度为6 000 K，核心压力下的熔化温度为6 300 K。这一结果还表明，地球液态外核的温度在3 500～5 100 K之间，与Anderson（1998）等推荐的数据一致。
- 铁 /
- 高压熔化线 /
- 表面预熔化 /
- 过热熔化
Abstract: High pressure melting curve of iron is crucial in modeling the earth's core. But a system deviation exists between the experimental data of static high-pressure experiments and those of the shock wave experiments. With the help of detailed analysis of possible melting mechanism in the two kinds of experiments, we correct the melting data directly from the experimental results and get a self-consistent high pressure melting curve of iron. This melting curve indicates the melting temperature of iron at the core/mantle boundary is about 3 850 K, and 6 000 K at the inner/out core boundary. This result is also consistent with the recommended value by Anderson.
- iron /
- high pressure melting curve /
- pre-melting of surface /
- over-hot melting

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参考文献(17)

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