CAREER: Elasticity and Lattice Dynamics of Iron Alloys under Earth's Core Conditions

职业：地球核心条件下铁合金的弹性和晶格动力学

基本信息

批准号：
1555388
负责人：
Bin Chen
金额：
$ 57万
依托单位：
University of Hawaii
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-02-15 至 2022-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1555388&HistoricalAwards=false
关键词：
CAREER Elasticity Lattice Dynamics Iron

项目摘要

Residing at the center of the Earth, the core is the innermost but extremely dynamic region of our planet. Over the last two decades, geophysicists have expended tremendous effort in deciphering the compositional makeup, thermal structure, and seismic features of the Earth's core. Understanding the nature and dynamics of the core can deeply enhance our abilities in understanding the magnetic field generation process, the thermo-chemical evolution of the Earth's deep interior, and the formation of the Earth as a habitable planet. This Faculty Early Career Development (CAREER) program aims to investigate the elasticity and lattice dynamics of iron alloys as candidates for the inner core under high pressure and temperature conditions of the core, using multiscale state-of-the-art experimental facilities. The outcome of the proposed research is a new set of fundamental mineral physics data on density, sound velocities, and single-crystal elasticity of iron alloys under previously uncharted pressure-temperature regimes, essential for us to provide further constraints on the core's composition and dynamics. The experimental results are to be integrated to a comprehensive mineral physics database for the core, cultivating collaborations with sister disciplines such as seismology, geodynamics and geochemistry, and ultimately enhancing our profound understanding of nature and dynamics of the Earth's deepest interior. Furthermore, the involvement of student researchers in the proposed research and the development of a research and teaching facility for high-pressure mineral and materials science will initiate the 'pipeline' that helps influence and attract diverse student population, particularly traditionally underrepresented minorities, into Earth science and build diverse geoscience workforce.This proposal aims to systematically measure high pressure-temperature elastic and vibrational properties of candidate iron alloys for the inner core, using synchrotron-based X-ray spectroscopies combined with resistively- and laser-heated diamond anvil cell techniques, so as to address the following scientific questions: (1) How do pressure and temperature affect the elastic and vibrational properties of iron alloys under core conditions? (2) What are the alloying effects of candidate light elements on the elasticity of iron under core conditions? (3) What are the single crystal elasticities of iron alloys approaching the core conditions, for the interpretation of the inner core's seismic anisotropy and fine-scale seismic? (4) Finally, what are the likely lighter alloying components in the inner core and what would that imply for the thermochemical evolution of the core and the planet? The integrated education and outreach objective is to train a new generation of independent solid Earth geoscientists in laboratory- and synchrotron-based facilities and to offer inquiry-base learning opportunities and experience to K-16 students through the implementation of a 'Multi-Anvil Press Laboratory' (MAPLab) teaching module to geosciences curricula. The results of the project will be widely disseminated on a timely manner through national and international meetings, public lectures and outreach, and news media.

地核位于地球的中心，是地球最内部但极其活跃的区域。在过去的二十年里，地球物理学家花费了巨大的努力来破译地核的成分组成、热结构和地震特征。了解地核的性质和动力学可以深刻增强我们理解磁场产生过程、地球深层内部热化学演化以及地球作为宜居行星形成的能力。该教师早期职业发展（CAREER）计划旨在利用多尺度最先进的实验设施，研究铁合金作为内核候选材料在核心高压和高温条件下的弹性和晶格动力学。拟议研究的成果是一组新的基础矿物物理数据，涉及先前未知的压力-温度条件下铁合金的密度、声速和单晶弹性，这对于我们对核心的成分和动力学提供进一步的约束至关重要。实验结果将被整合到一个综合的矿物物理核心数据库中，培养与地震学、地球动力学和地球化学等姐妹学科的合作，最终增强我们对地球最深处的自然和动力学的深刻理解。此外，学生研究人员参与拟议的研究以及高压矿物和材料科学研究和教学设施的开发将启动“管道”，帮助影响和吸引不同的学生群体，特别是传统上代表性不足的少数族裔进入地球科学并建立多样化的地球科学队伍。该提案旨在利用基于同步加速器的 X 射线光谱学与电阻加热和激光加热金刚石相结合，系统地测量内核候选铁合金的高压-温度弹性和振动特性砧细胞技术，以解决以下科学问题：（1）压力和温度如何影响核心条件下铁合金的弹性和振动性能？（2）候选轻元素对铁芯条件下的弹性有什么合金化作用？（3）接近核心条件的铁合金的单晶弹性是多少，以解释内核的地震各向异性和细尺度地震？ (4) 最后，内核中可能存在哪些较轻的合金成分，这对内核和行星的热化学演化意味着什么？综合教育和推广目标是在实验室和同步加速器设施中培训新一代独立固体地球科学家，并通过实施“多砧压机”为 K-16 学生提供探究式学习机会和经验实验室（MAPLab）地球科学课程教学模块。该项目的成果将通过国内和国际会议、公开讲座和宣传以及新闻媒体及时广泛传播。

项目成果

期刊论文数量（15）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

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：
2023-03
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

Experimental constraints on the sound velocities of cementite Fe3C to core pressures

渗碳体 Fe3C 声速对岩心压力的实验约束

DOI：
10.1016/j.epsl.2018.05.002
发表时间：
2018-07
期刊：
Earth and Planetary Science Letters
影响因子：
5.3
作者：
Chen, Bin;Lai, Xiaojing;Li, Jie;Liu, Jiachao;Zhao, Jiyong;Bi, Wenli;Ercan Alp, E.;Hu, Michael Y.;Xiao, Yuming
通讯作者：
Xiao, Yuming

Quasi 3D polymerization in C 60 bilayers in a fullerene solvate

富勒烯溶剂化物中 C 60 双层的准 3D 聚合

DOI：
10.1016/j.carbon.2017.09.010
发表时间：
2017-11
期刊：
Carbon
影响因子：
10.9
作者：
Pei, Cuiying;Feng, Meina;Yang, Zhenxing;Yao, Mingguang;Yuan, Ye;Li, Xin;Hu, Bingwen;Shen, Ming;Chen, Bin;Sundqvist, Bertil;et al
通讯作者：
et al

Density of Fe‐Ni‐C Liquids at High Pressures and Implications for Liquid Cores of Earth and the Moon

高压下 Fe-Ni-C 液体的密度及其对地球和月球液体核心的影响

DOI：
10.1029/2020jb021089
发表时间：
2021-03
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
0
作者：
Zhu, Feng;Lai, Xiaojing;Wang, Jianwei;Amulele, George;Kono, Yoshio;Shen, Guoyin;Jing, Zhicheng;Manghnani, Murli H.;Williams, Quentin;Chen, Bin
通讯作者：
Chen, Bin

Polyamorphic Transformations in Fe-Ni-C Liquids: Implications for Chemical Evolution of Terrestrial Planets: Fe-Ni-C liquid structural change

Fe-Ni-C 液体中的多晶转变：对类地行星化学演化的影响：Fe-Ni-C 液体结构变化