Search: WFRF:(Crichton W A)
> (2003-2004) >
Iron-silica interac...
Iron-silica interaction at extreme conditions and the electrically conducting layer at the base of Earth's mantle
-
- Dubrovinsky, L. (author)
- Bayerisches Geoinstitut, Universität Bayreuth
-
- Dubrovinskaia, N. (author)
- Bayerisches Geoinstitut, Universität Bayreuth
-
- Langenhorst, F. (author)
- Bayerisches Geoinstitut, Universität Bayreuth
-
show more...
-
- Dobson, D. (author)
- Bayerisches Geoinstitut, Universität Bayreuth
-
- Rubie, D. (author)
- Bayerisches Geoinstitut, Universität Bayreuth
-
- Gessgmann, C. (author)
- Max-Planck-Institut für Chemie, Mainz
-
- Abrikosov, I. A. (author)
- Condensed Matter Theory Group, Department of Physics, Uppsala University
-
- Johansson, Börje (author)
- KTH,Materialvetenskap
-
- Baykov, Vitaly (author)
- KTH,Materialvetenskap
-
- Vitos, Levente (author)
- KTH,Materialvetenskap
-
- Le Bihan, T. (author)
- European Synchrotron Radiation Facility, Grenoble
-
- Crichton, W. A. (author)
- European Synchrotron Radiation Facility, Grenoble
-
- Dmitriev, V. (author)
- Swiss-Norwegian Beam Lines at ESRF, Grenoble
-
- Weber, H. P. (author)
- Swiss-Norwegian Beam Lines at ESRF, Grenoble
-
show less...
-
(creator_code:org_t)
- 2003-03-06
- 2003
- English.
-
In: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 422:6927, s. 58-61
- Related links:
-
https://urn.kb.se/re...
-
show more...
-
https://doi.org/10.1...
-
show less...
Abstract
Subject headings
Close
- The boundary between the Earth's metallic core and its silicate mantle is characterized by strong lateral heterogeneity and sharp changes in density, seismic wave velocities, electrical conductivity and chemical composition(1-7). To investigate the composition and properties of the lowermost mantle, an understanding of the chemical reactions that take place between liquid iron and the complex Mg-Fe-Si-Al-oxides of the Earth's lower mantle is first required(8-15). Here we present a study of the interaction between iron and silica (SiO2) in electrically and laser-heated diamond anvil cells. In a multianvil apparatus at pressures up to 140 GPa and temperatures over 3,800 K we simulate conditions down to the core-mantle boundary. At high temperature and pressures below 40 GPa, iron and silica react to form iron oxide and an iron-silicon alloy, with up to 5 wt% silicon. At pressures of 85-140 GPa, however, iron and SiO2 do not react and iron-silicon alloys dissociate into almost pure iron and a CsCl-structured (B2) FeSi compound. Our experiments suggest that a metallic silicon-rich B2 phase, produced at the core-mantle boundary (owing to reactions between iron and silicate(2,9,10,13)), could accumulate at the boundary between the mantle and core and explain the anomalously high electrical conductivity of this region(6).
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Annan teknik -- Övrig annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies -- Other Engineering and Technologies not elsewhere specified (hsv//eng)
Keyword
- HIGH-PRESSURE; LIQUID-IRON; INNER-CORE; X-RAY; BOUNDARY; TEMPERATURES; METAL; HETEROGENEITY
- Material physics with surface physics
- Materialfysik med ytfysik
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
-
Nature
(Search for host publication in LIBRIS)
To the university's database
- By the author/editor
-
Dubrovinsky, L.
-
Dubrovinskaia, N ...
-
Langenhorst, F.
-
Dobson, D.
-
Rubie, D.
-
Gessgmann, C.
-
show more...
-
Abrikosov, I. A.
-
Johansson, Börje
-
Baykov, Vitaly
-
Vitos, Levente
-
Le Bihan, T.
-
Crichton, W. A.
-
Dmitriev, V.
-
Weber, H. P.
-
show less...
- About the subject
-
- ENGINEERING AND TECHNOLOGY
-
ENGINEERING AND ...
-
and Other Engineerin ...
-
and Other Engineerin ...
- Articles in the publication
-
Nature
- By the university
-
Royal Institute of Technology