Melting of compressed iron-alloys by monitoring atomic dynamics

通过监测原子动力学熔化压缩铁合金

基本信息

  • 批准号:
    1727020
  • 负责人:
  • 金额:
    $ 32.4万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2017
  • 资助国家:
    美国
  • 起止时间:
    2017-09-15 至 2022-08-31
  • 项目状态:
    已结题

项目摘要

The Earth's core is 16% of the planet by volume. It is composed primarily of iron, but includes a quantity of lighter elements whose presence, but not identity, is inferred from geophysical measurements. The core consists of a solid inner section surrounded by a convecting, liquid outer layer. It creates Earth's magnetic field, protecting the planet from space weather events such as solar flares, and provides the heat for plate tectonics as the liquid core freezes. The core begins approximately 2900 km below the Earth's surface, making it difficult to determine its exact composition and temperature profile, so scientists rely on laboratory experiments and an evolving model to infer core characteristics. Under this NSF award, the PI is developing a new application of the Mössbauer effect utilizing synchrotron X-radiation to populate data points on the melting curve of an iron-nickel alloy, a primary component of Earth's core. This project will provide support and training for students at the undergraduate and graduate level, who will be trained in experimental research utilizing national synchtrotron radiation facilities.Laser heated diamond anvil cells, time-resolved synchrotron Mössbauer spectroscopy, x-ray diffraction and a recently developed fast temperature readout spectrometer are used to carry out these measurements. X-ray photons at one of iron's Mössbauer resonant energies are focused on the sample in a laser heated diamond anvil cell, and when melting occurs, the characteristic Mössbauer signal abruptly decreases. Thus, time-resolved Mössbauer spectroscopy provides an excellent diagnostic for the first melt formed in the sample chamber. These outcomes will represent a significant step towards understanding the melting of iron-rich alloys at conditions of terrestrial-type planetary cores. This is in addition to applying a new method that measures the atomic dynamics to the effort of determining melting at high-pressures. The proposed research agenda offers a unique synergy and training ground for the involved students to apply state-of-the-art experimental techniques at multiple facilities, including advanced radiation sources at national facilities, to scientific problems in the area of high-pressure melting investigations of Earth materials, an active area of research.
地核体积占地球体积的16%。它主要由铁组成,但也包括一些较轻的元素,这些元素的存在,但不是身份,是从地球物理测量推断出来的。核心是由一个固体内部部分包围对流,液体外层。它创造了地球的磁场,保护地球免受太阳耀斑等太空天气事件的影响,并在液体核心冻结时为板块构造提供热量。核心开始于地球表面以下约2900公里处,因此很难确定其确切的成分和温度分布,因此科学家们依靠实验室实验和不断发展的模型来推断核心特征。在NSF的这一奖项下,PI正在开发一种新的穆斯堡尔效应应用,利用同步加速器X射线辐射来填充铁镍合金熔化曲线上的数据点,铁镍合金是地球核心的主要组成部分。 该项目将为本科生和研究生提供支助和培训,他们将接受利用国家同步加速器辐射设施进行实验研究的培训,使用激光加热金刚石砧座、时间分辨同步加速器穆斯堡尔光谱仪、X射线衍射和最近开发的快速温度读出光谱仪进行这些测量。X射线光子在铁的穆斯堡尔共振能量之一聚焦在激光加热的金刚石砧室中的样品上,当熔化发生时,特征穆斯堡尔信号突然减少。因此,时间分辨穆斯堡尔谱为样品室中形成的第一熔体提供了极好的诊断。这些结果将是理解地球型行星核心条件下富铁合金熔化的重要一步。这是除了应用一种新的方法,测量原子动力学的努力,确定在高压下熔化。拟议的研究议程为参与的学生提供了独特的协同作用和培训基础,使他们能够在多个设施中应用最先进的实验技术,包括在国家设施中应用先进的辐射源,以解决地球材料高压熔化研究领域的科学问题,这是一个活跃的研究领域。

项目成果

期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
High pressure thermoelasticity and sound velocities of Fe-Ni-Si alloys
  • DOI:
    10.1016/j.pepi.2019.05.011
  • 发表时间:
    2019-09-01
  • 期刊:
  • 影响因子:
    2.3
  • 作者:
    Morrison, Rachel A.;Jackson, Jennifer M.;Toellner, Thomas S.
  • 通讯作者:
    Toellner, Thomas S.
Melting and phase relations of Fe-Ni-Si determined by a multi-technique approach
  • DOI:
    10.1016/j.epsl.2021.117358
  • 发表时间:
    2022-03-17
  • 期刊:
  • 影响因子:
    5.3
  • 作者:
    Dobrosavljevic, Vasilije V.;Zhang, Dongzhou;Jackson, Jennifer M.
  • 通讯作者:
    Jackson, Jennifer M.
Equations of State and Anisotropy of Fe‐Ni‐Si Alloys
Fe-Ni-Si合金的状态方程和各向异性
  • DOI:
    10.1029/2017jb015343
  • 发表时间:
    2018
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Morrison, Rachel A.;Jackson, Jennifer M.;Sturhahn, Wolfgang;Zhang, Dongzhou;Greenberg, Eran
  • 通讯作者:
    Greenberg, Eran
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Jennifer Jackson其他文献

NBER WORKING PAPER SERIES STILL WORTH THE TRIP? SCHOOL BUSING EFFECTS IN BOSTON AND NEW YORK
NBER 工作论文系列仍然值得一游吗?
  • DOI:
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Joshua D Angrist;Guthrie Gray;Clemence M. Idoux;Parag A. Pathak;E. Heying;Jennifer Jackson;Jim Shen
  • 通讯作者:
    Jim Shen
Clinician perspectives of social connectedness in an adjunctive group program for youth with severe and complex depression: a qualitative analysis
临床医生对患有严重和复杂抑郁症的青少年辅助团体计划中社会联系的看法:定性分析
  • DOI:
    10.1080/13284207.2023.2231603
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    1.5
  • 作者:
    Nicole J. Moore;Abi Brooker;S. Cotton;Kieran M O'Gorman;Jennifer Jackson;B. McKechnie;S. Rice
  • 通讯作者:
    S. Rice
Risk Factor Stratification for COPD Exacerbation in an Outpatient Population Resulting in Acute Healthcare Resource Utilization
  • DOI:
    10.1378/chest.1389192
  • 发表时间:
    2012-10-01
  • 期刊:
  • 影响因子:
  • 作者:
    Furqan Shoaib Siddiqi;Rachael Hauser;Peg Bicker;Jennifer Jackson
  • 通讯作者:
    Jennifer Jackson
Are You Smarter Than Your Smart Pump?
  • DOI:
    10.1016/j.jopan.2013.04.045
  • 发表时间:
    2013-06-01
  • 期刊:
  • 影响因子:
  • 作者:
    Daisy Fischer;Meredith Pattin;Jennifer Jackson
  • 通讯作者:
    Jennifer Jackson
Effects of Shoreline Development on Composition and Physical Structure of Plants in a South Carolina High Marsh
  • DOI:
    10.1007/s12237-013-9659-3
  • 发表时间:
    2013-06-22
  • 期刊:
  • 影响因子:
    2.300
  • 作者:
    Zofia Noe;Jennifer Jackson;John J. Hutchens;Keith Walters;James O. Luken;Kevin S. Godwin
  • 通讯作者:
    Kevin S. Godwin

Jennifer Jackson的其他文献

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{{ truncateString('Jennifer Jackson', 18)}}的其他基金

CSEDI: Integrated seismic, geodynamic, and mineral physics studies of scatterers and other multi-scale structures in Earth’s lower mantle
CSEDI:地球下地幔散射体和其他多尺度结构的综合地震、地球动力学和矿物物理研究
  • 批准号:
    2303148
  • 财政年份:
    2023
  • 资助金额:
    $ 32.4万
  • 项目类别:
    Continuing Grant
Melting of compressed iron-alloys using a multi-technique approach
使用多种技术方法熔化压缩铁合金
  • 批准号:
    2212068
  • 财政年份:
    2022
  • 资助金额:
    $ 32.4万
  • 项目类别:
    Standard Grant
CSEDI: Integrated seismic, geodynamic, and mineral physics studies of multi-scale structures in the lowermost mantle
CSEDI:最下地幔多尺度结构的地震、地球动力学和矿物物理综合研究
  • 批准号:
    2009935
  • 财政年份:
    2020
  • 资助金额:
    $ 32.4万
  • 项目类别:
    Continuing Grant
AGEP EAGER: Exploring Conditions for Systemic Equity Transformation that Advance Women and Minority STEM Faculty
AGEP EAGER:探索促进女性和少数族裔 STEM 教师发展的系统性公平转型条件
  • 批准号:
    1935469
  • 财政年份:
    2019
  • 资助金额:
    $ 32.4万
  • 项目类别:
    Standard Grant
CSEDI: Integrated seismic, geodynamic, and mineral physics studies of the deepest lower mantle
CSEDI:最深下地幔的综合地震、地球动力学和矿物物理研究
  • 批准号:
    1600956
  • 财政年份:
    2016
  • 资助金额:
    $ 32.4万
  • 项目类别:
    Continuing Grant
Melting of compressed iron-alloys by monitoring atomic dynamics
通过监测原子动力学熔化压缩铁合金
  • 批准号:
    1316362
  • 财政年份:
    2013
  • 资助金额:
    $ 32.4万
  • 项目类别:
    Standard Grant
CAREER: Investigations on the elastic and vibrational properties of mantle silicates and oxides
职业:研究地幔硅酸盐和氧化物的弹性和振动特性
  • 批准号:
    0956166
  • 财政年份:
    2010
  • 资助金额:
    $ 32.4万
  • 项目类别:
    Continuing Grant
Teaching Excellence At College for High Achievement in West Virginia (TEACH-WV)
西弗吉尼亚州卓越教学学院 (TEACH-WV)
  • 批准号:
    0833111
  • 财政年份:
    2009
  • 资助金额:
    $ 32.4万
  • 项目类别:
    Standard Grant
Elasticity of Selected Deep Earth Phases Under Simultaneous High P-T Conditions Using Nuclear Resonant Inelastic X-ray Scattering
使用核共振非弹性 X 射线散射在同时高 P-T 条件下选定的深层地球相的弹性
  • 批准号:
    0711542
  • 财政年份:
    2007
  • 资助金额:
    $ 32.4万
  • 项目类别:
    Continuing Grant

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基于压缩传感理论的高时空分辨率动态磁共振成像关键技术研究
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