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Elastic properties ...
Elastic properties of iron-rich hcp Fe-Mg alloys up to Earth's core pressures
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- Kádas, Krisztina (author)
- Uppsala universitet,Institutionen för fysik och materialvetenskap
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- Vitos, Levente (author)
- Uppsala universitet,KTH,Tillämpad materialfysik,Materialteori
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- Ahuja, Rajeev (author)
- Uppsala universitet,KTH,Materialvetenskap,Institutionen för fysik och materialvetenskap
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(creator_code:org_t)
- Elsevier BV, 2008
- 2008
- English.
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In: Earth and Planetary Science Letters. - : Elsevier BV. - 0012-821X .- 1385-013X. ; 271:1-4, s. 221-225
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Using density functional theory formulated within the framework of the exact muffin-tin orbital method, we investigate the elastic properties of hexagonal closed-packed Fe-Mg alloys, containing 5 and 10 at.% Mg, up to pressures of the Earth's inner core. We demonstrate the effect of Mg alloying on the hexagonal axial ratio, elastic constants, density and sound wave velocities. We find that 10% Mg alloying decreases the shear modulus of iron by 23% and reduces the transverse sound velocity, nu(s) by 12% at core pressures. Although it is debated whether or not Mg can partition into the core, our results support Mg as a candidate light element in the core.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- ab initio
- elasticity
- pressure
- Earth's inner core
- centered-cubic iron
- inner-core
- x-ray
- thermal-expansion
- potential
- model
- ab-initio
- in-situ
- approximation
- temperature
- transition
- Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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