Effect of Si on liquid Fe compressibility: Implications for sound velocity in core materials
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- C. Sanloup
- Laboratoire MAGIE Universitã Paris‐6 Paris France
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- G. Fiquet
- Laboratoire de Minéralogie‐Cristallographie Université Paris‐6 Paris France
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- E. Gregoryanz
- Laboratoire de Minéralogie‐Cristallographie Université Paris‐6 Paris France
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- G. Morard
- Laboratoire de Minéralogie‐Cristallographie Université Paris‐6 Paris France
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- M. Mezouar
- Experiments Division European Synchrotron Radiation Facility Grenoble France
書誌事項
- 公開日
- 2004-04
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2004gl019526
- 公開者
- American Geophysical Union (AGU)
この論文をさがす
説明
<jats:p>Density of liquid Fe‐Si alloys was measured in situ up to 5 GPa‐1725 K by an X‐ray absorption technique using synchrotron radiation. Increasing the amount of silicon in liquid iron decreases the bulk incompressibility by only −0.5 GPa per 1 weight% of Si. These data confirm our previous prediction of a negligible effect of Si on liquid Fe bulk properties, prediction based on the observation of a similar local structure in liquid Fe and liquid Fe‐Si alloys. Si and S have therefore opposite effects on P‐waves velocity (<jats:italic>v</jats:italic><jats:sub><jats:italic>P</jats:italic></jats:sub> = <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/grl18089-math-0001.gif" xlink:title="equation image"/>), both elements reduce the bulk density of liquid iron but only S affects its compressibility. Since compression‐wave velocities in the Earth's outer core are slightly higher than in pure liquid Fe in the same P‐T conditions, it implies that Si would correct this discrepancy while S would increase it.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 31 (7), L07604-, 2004-04
American Geophysical Union (AGU)
