globalchange  > 气候减缓与适应
DOI: 10.1002/grl.50992
论文题名:
Sound velocity of hexagonal close-packed iron up to core pressures
作者: Ohtani E.; Shibazaki Y.; Sakai T.; Mibe K.; Fukui H.; Kamada S.; Sakamaki T.; Seto Y.; Tsutsui S.; Baron A.Q.R.
刊名: Geophysical Research Letters
ISSN: 0094-8474
EISSN: 1944-8205
出版年: 2013
卷: 40, 期:19
起始页码: 5089
结束页码: 5094
语种: 英语
英文关键词: hcp-iron ; high pressure ; inelastic X-ray scattering ; inner core ; sound velocity
Scopus关键词: hcp-iron ; Hexagonal close-packed irons ; High pressure ; Inelastic X ray scattering ; Inner core ; Preliminary reference earth models ; Situ X-ray powder diffraction ; Theoretical calculations ; Chemical elements ; Temperature distribution ; Wave propagation ; X ray powder diffraction ; X ray scattering ; X rays ; Acoustic wave velocity ; high pressure ; high temperature ; inner core ; iron ; sound velocity ; temperature effect ; X-ray diffraction
英文摘要: We determined the compressional velocity of hcp-Fe using high-resolution inelastic X-ray scattering combined with in situ X-ray powder diffraction: Our measurements extend up to 174 GPa at room temperature, to 88 GPa at 700 K, and to 61.5 GPa at 1000 K. Our data, including those obtained at high temperature, are well described by a linear relation to density, extending the range of verification of Birch's law and suggesting only small temperature dependence up to 1000 K. This result, once compared to the preliminary reference Earth model seismologically based model, indicates that there is either a strong temperature effect on Birch's law above 1000 K or the composition of the core is rather different than expected, containing, e.g., heavy impurities. Noting that both recent theoretical calculations and shock wave velocity measurements are consistent with modification of Birch's law at high temperature, we favor the former explanation. Key Points We measured the velocity of hcp-Fe to 174 GPa and 300 K by IXS We confirmed no temperature dependence on Birch's law to 60 GPa and 1000 K We argued the light elements in the inner core based on the present study ©2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885009024&doi=10.1002%2fgrl.50992&partnerID=40&md5=facfa4bb1d99413541a8ffeb5979cc12
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5738
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作者单位: Department of Earth Science, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan

Recommended Citation:
Ohtani E.,Shibazaki Y.,Sakai T.,et al. Sound velocity of hexagonal close-packed iron up to core pressures[J]. Geophysical Research Letters,2013-01-01,40(19).
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