在200 GPa冲击压强下铁是否会发生固-固相变？

黄海军; 蔡灵仓; 田旭

doi:10.11858/gywlxb.2007.02.015

在200 GPa冲击压强下铁是否会发生固-固相变？

doi: 10.11858/gywlxb.2007.02.015

1.
武汉理工大学理学院，湖北武汉 430070；
2.
中国工程物理研究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:
黄海军

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出版历程
- 收稿日期: 2007-02-15
- 修回日期: 2007-03-30
- 发布日期: 2007-06-05

Does There Exist a Solid-Solid Transformation in Shocked Iron at around 200 GPa?

1.
College of Science, Wuhan University of Technology, Wuhan 430070, China;
2.
Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Mianyang 621900, China

More Information

Corresponding author: HUANG Hai-Jun

摘要

摘要: 根据Grneisen物态方程、Hugoniot内能守恒方程和最新发表的铁的热物理参数，计算了-(hcp)铁和液态铁的理论Hugoniot曲线。计算的Hugoniot曲线与最新修正的铁的实验数据[J Appl Phys, 2000, 88: 5496]在总体上符合很好，并且可以细分为两个部分：在约低于200 GPa的压强区，用-铁模型的计算结果与实验结果符合很好；在约高于260 GPa的压强区，用液态铁模型的计算结果与实验数据也符合得比较好；对介于200~260 GPa之间的压强区，则归属于由-铁向液态铁转变的混合相区。这意味着铁的Hugoniot曲线在约200 GPa处出现的微小偏折是由固-液相变引起的，从而否定了Brown [Geophy Res Lett, 2001, 28: 4339]提出的它是一次由-铁向另一个未知结构的某个固相铁的相转变的见解。
- 铁 /
- 高压相变 /
- 状态方程
Abstract: A theoretical Hugoniot curve of iron has been calculated based on Grneisen equation of state and internal energy conservation consideration, using a set of optimized or thermophysical parameters and both - and liquid-iron models. This determined Hugoniot curve is well in accord with the revised Hugoniot data [J Appl Phys, 2000, 88: 5496] on the whole, and could be further divided into two parts. The first one can well describe the revised data below ~200 GPa with -phase model, while the second can approximately replicate the revised data above ~260 GPa with liquid-phase model. It is thus convinced that the range between ~200 GPa and ~260 GPa should be in solid/liquid mixed state, i. e, a small kink appearing on the revised Hugoniot at ~200 GPa is due to a solid-liquid transition, rather than a solid-solid transition at ~200 GPa that was inferred from Brown's analysis [Geophys Res Lett, 2001, 28: 4339].
- iron /
- high pressure phase transition /
- equation of state

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