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Effect of Hydrogen on the Sulfur-rich Martian Core

氢对富含硫的火星核心的影响

基本信息

批准号：
2005567
负责人：
Sang-Heon Shim
金额：
$ 29.5万
依托单位：
Arizona State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-07-01 至 2023-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2005567&HistoricalAwards=false
关键词：
Effect Hydrogen Sulfur rich Martian

项目摘要

Studies of Mars over the past twenty years have determined that early in its history the climate was warm enough for water to flow on its surface. Liquid water is not found on the surface of Mars today, because the surface is too cold and the atmosphere too thin. The cause of this change might be the loss of the planet’s global magnetic field, allowing the solar radiation to strip the atmosphere. This would imply a major change took place in the planet’s core, shutting off the dynamo responsible for the magnetic field. The role of hydrogen in the dynamics and structure of the Martian core is poorly understood. Hydrogen is known to form alloys with metallic iron at high pressure. This program will conduct a systematic study of the phase relations of such alloys at the pressure and temperature conditions expected for the Martian core. This research will provide Arizona State University undergraduate students with comprehensive research experiences. Teaching modules motivated by this research will be implemented in coding and data analysis courses at ASU. The primary goal of this project is to advance the understanding of the dynamics and structure of the Martian core by conducting experiments to measure the melting behavior and sub-solidus phase relations in Fe-S-H systems at pressures of 25-40 Gigapascals (GPs) expected to exist at the Martian core. To achieve this goal a series of high-pressure, high temperature experiments will be conducted for: (1) possible miscibility (or solubility) gaps in Fe-S-H systems at high pressure and high temperature conditions relevant to the Martian core, (2) the effects of hydrogen on the melting temperature of sulfide alloys and (3) sub-solidus phase relations in Fe-S-H systems at high pressures and high temperatures.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

过去二十年来对火星的研究已经确定，在火星历史的早期，气候足够温暖，水可以在火星表面流动。今天在火星表面找不到液态水，因为火星表面太冷，大气太薄。这种变化的原因可能是地球的全球磁场的丧失，使得太阳辐射剥离了大气层。这将意味着行星核心发生了重大变化，关闭了负责磁场的发电机。人们对氢在火星核心的动力学和结构中的作用知之甚少。众所周知，氢在高压下与金属铁形成合金。该计划将对这类合金在火星核心预期的压力和温度条件下的相关系进行系统的研究。这项研究将为亚利桑那州立大学本科生提供全面的研究经验。这项研究推动的教学模块将在亚利桑那州立大学的编码和数据分析课程中实施。该项目的主要目标是通过实验测量在预计存在于火星核心的25-40吉帕斯卡(GPs)压力下Fe-S-H系统的熔化行为和亚固相关系，以促进对火星核心动力学和结构的理解。为了实现这一目标，将进行一系列高压高温实验：(1)与火星核心相关的高压和高温条件下Fe-S-H系统中可能存在的混溶(或溶解)缺口，(2)氢对硫化物合金熔化温度的影响，以及(3)高压和高温下Fe-S-H系统中的亚固相关系。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（6）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Stable hexagonal ternary alloy phase in Fe-Si-H at 28.6–42.2 GPa and 3000 K

Fe-Si-H 中稳定的六方三元合金相，在 28.6–42.2 GPa 和 3000 K 下

DOI：
10.1103/physrevb.105.104111
发表时间：
2022
期刊：
Physical Review B
影响因子：
3.7
作者：
Fu, Suyu;Chariton, Stella;Prakapenka, Vitali B.;Chizmeshya, Andrew;Shim, Sang-Heon
通讯作者：
Shim, Sang-Heon

Hydrogen solubility in FeSi alloy phases at high pressures and temperatures

DOI：
10.2138/am-2022-8295
发表时间：
2022-12-16
期刊：
AMERICAN MINERALOGIST
影响因子：
3.1
作者：
Fu, Suyu;Chariton, Stella;Shim, Sang-Heon
通讯作者：
Shim, Sang-Heon

Superstoichiometric Alloying of H and Close‐Packed Fe‐Ni Metal Under High Pressures: Implications for Hydrogen Storage in Planetary Core

高压下 H 和密堆积 Fe-Ni 金属的超化学计量合金化：对行星核心储氢的影响

DOI：
10.1029/2022gl101155
发表时间：
2023
期刊：
Geophysical Research Letters
影响因子：
5.2
作者：
Piet, Hélène;Chizmeshya, Andrew;Chen, Bin;Chariton, Stella;Greenberg, Eran;Prakapenka, Vitali;Buseck, Peter;Shim, Sang‐Heon
通讯作者：
Shim, Sang‐Heon

Core origin of seismic velocity anomalies at Earth’s core–mantle boundary