Thermal and electrical conductivity of solid iron and iron–silicon mixtures at Earth's core conditions
نویسندگان
چکیده
a Department of Earth Sciences, Department of Physics and Astronomy, London Centre for Nanotechnology and Thomas Young Centre@UCL, University College London, Gower Street, London WC1E 6BT, United Kingdom b School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK c Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California at San Diego, 9500 Gilman Drive no. 0225, La Jolla, CA 92093-0225, USA
منابع مشابه
Electrical and thermal transport properties of iron and iron-silicon alloy at high pressure
[1] The efficiency of heat transfer by conduction in the Earth’s core controls the dynamics of convection and limits the power available for the geodynamo. We have measured the room temperature electrical resistivity of iron and iron-silicon alloy to 60GPa and present a new model of the resistivity at high pressures and temperatures relevant to the Earth’s core. The model is compared with avail...
متن کاملElectrical resistivity and thermal conductivity of liquid Fe alloys at high P and T, and heat flux in Earth's core.
Earth's magnetic field is sustained by magnetohydrodynamic convection within the metallic liquid core. In a thermally advecting core, the fraction of heat available to drive the geodynamo is reduced by heat conducted along the core geotherm, which depends sensitively on the thermal conductivity of liquid iron and its alloys with candidate light elements. The thermal conductivity for Earth's cor...
متن کاملSaturation of electrical resistivity of solid iron at Earth’s core conditions
We report on the temperature dependence of the electrical resistivity of solid iron at high pressure, up to and including conditions likely to be found at the centre of the Earth. We have extended some of the calculations of the resistivities of pure solid iron we recently performed at Earth's core conditions (Pozzo et al. in Earth Planet Sci Lett 393:159-164, 2014) to lower temperature. We sho...
متن کاملPhysics of the Earth and Planetary Interiors Ab Initio Lattice Dynamics Calculations on the Combined Effect of Temperature and Silicon on the Stability of Different Iron Phases in the Earth's Inner Core
The Earth’s solid inner core consists mainly of iron (Fe), alloyed with lighter elements, such as silicon (Si). Interpretation of seismic anisotropy and layering requires knowledge of the stable crystal structure in the inner core. We report ab initio density functional theory calculations on the free energy and vibrational stability of pure iron and Fe–Si alloys at conditions representative of...
متن کاملLattice thermal conductivity of lower mantle minerals and heat flux from Earth's core.
The amount of heat flowing from Earth's core critically determines the thermo-chemical evolution of both the core and the lower mantle. Consisting primarily of a polycrystalline aggregate of silicate perovskite and ferropericlase, the thermal boundary layer at the very base of Earth's lower mantle regulates the heat flow from the core, so that the thermal conductivity (k) of these mineral phase...
متن کامل