| 项目编号: | 1452545
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| 项目名称: | EAR-PF: Diffusion anisotropy in Earth's inner core |
| 作者: | Jeffrey Pigott
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| 承担单位: | Pigott Jeffrey S
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| 批准年: | 2014
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| 开始日期: | 2015-09-01
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| 结束日期: | 2018-04-30
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| 资助金额: | USD174000
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| 资助来源: | US-NSF
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| 项目类别: | Fellowship
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Earth Sciences
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| 英文关键词: | inner core
; seismic anisotropy
; earth
; hcp-fe
; self-diffusion
; diffusion anisotropy
; earth science
; nsf earth sciences postdoctoral fellowship
; axial self-diffusion coefficient
; undergraduate researcher
; diffusion experiment
; self-diffusion anisotropy
|
| 英文摘要: | Dr. Jeffrey Pigott has been awarded an NSF Earth Sciences Postdoctoral Fellowship to conduct research at Case Western Reserve University (CWRU) and carry out activities to broaden participation in the Earth sciences. Earth's inner core has recently been revealed to be structurally complex, with significant seismic anisotropy, seismic waves traveling faster in the polar direction than in the equatorial plane. This seismic anisotropy varies in magnitude hemispherically and as a function of depth. This project aims to determine how this seismic anisotropy relates to crystal structure and solid-state deformation. To increase diversity in the geosciences, Dr. Pigott will mentor an undergraduate researcher and leverage existing partnerships with Cleveland area high schools.
The seismic anisotropy in Earth's inner core likely results from crystallographic preferred orientation of the hexagonal close-packed (hcp) iron-nickel alloy that is thought to be stable under inner core conditions, but how this texturing developed remains a subject of debate. Constraining the diffusion anisotropy and solid-state viscosity of the inner core is critical to understanding the link between deformation and seismic anisotropy. Dr. Pigott will quantify the self-diffusion anisotropy in Earth's inner core through atomistic simulations and first principles calculations of the axial self-diffusion coefficients in hcp-Fe at inner core conditions coupled with diffusion experiments using the analog metal hcp-Zn. Internally-consistent first principles calculations of the elasticity of hcp-Fe will elucidate the relationship between diffusion, deformation, and elasticity and allow for robust modeling of the state and evolution of Earth's inner core. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/93460
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Jeffrey Pigott. EAR-PF: Diffusion anisotropy in Earth's inner core. 2014-01-01.
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