Thermal Conductivity of Periclase (MgO) from First Principles

Stackhouse, Stephen; Stixrude, Lars; Karki, Bijaya B.

doi:10.1103/physrevlett.104.208501

Cited by 134 publications

(111 citation statements)

References 31 publications

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…for the oxide phases (Debye theory; 19,20), and for the perovskite phases (modified Debye theory; 13,22). K 0 T is the pressure derivative of the isothermal bulk modulus, γ the Grüneisen parameter, and q ¼ −ð∂ ln γ∕∂ ln ρÞ T .…”

Section: Resultsmentioning

confidence: 99%

“…Recent first-principles computations of lattice k in MgO periclase has shown that Debye theory (Eq. 2, see below) gives an excellent representation of the density dependence of k in a simple oxide (19)(20)(21), while a recent set of experimental measurements (22) indicates that the density dependence of k in more complex solids can be represented by removing the assumption that the phonon group velocities are proportional to the Debye temperature (13; Eq. 3, see below).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Lattice thermal conductivity of lower mantle minerals and heat flux from Earth’s core

Manthilake

Koker

Frost

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

108

122

View full text Add to dashboard Cite

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 phases controls the amount of heat entering the lowermost mantle. Here we report measurements of the lattice thermal conductivity of pure, Al-, and Fe-bearing MgSiO 3 perovskite at 26 GPa up to 1,073 K, and of ferropericlase containing 0, 5, and 20% Fe, at 8 and 14 GPa up to 1,273 K. We find the incorporation of these elements in silicate perovskite and ferropericlase to result in a ∼50% decrease of lattice thermal conductivity relative to the end member compositions. A model of thermal conductivity constrained from our results indicates that a peridotitic mantle would have k¼9.1AE1.2 W∕m K at the top of the thermal boundary layer and k¼8.4AE1.2 W∕m K at its base. These values translate into a heat flux of 11.0AE1.4 terawatts (TW) from Earth's core, a range of values consistent with a variety of geophysical estimates.D" | core-mantle boundary | high pressure T he 46 AE 3 terawatts (TW) of heat flowing from the solid Earth (1, 2) is one of the prime geophysical constraints on the dynamic state of the planet. As an integrated quantity, this global value does not distinguish individual contributions from the mantle and the core.

show abstract

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Lattice thermal conductivity of lower mantle minerals and heat flux from Earth’s core

Manthilake

Koker

Frost

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

108

122

View full text Add to dashboard Cite

show abstract

“…Recent technical progress both in the experiment and the theoretical calculation enables us to reveal high-pressure and high-temperature behavior of lattice thermal diffusivity (and conductivity) of lower mantle minerals, MgSiO 3 perovskite and MgO periclase (de Koker 2010;Stackhouse et al 2010;Tang and Dong 2010;Manthilake et al 2011;Haigis et al 2012;Ohta et al 2012;Dekura et al 2013). However, there is only one report regarding the effect of chemical impurity on the lattice conductivity of the lower mantle minerals (Manthilake et al 2011).…”

Section: Introductionmentioning

confidence: 96%

Thermal diffusivities of MgSiO3 and Al-bearing MgSiO3 perovskites

Ohta

Yagi

Hirose

2014

American Mineralogist

View full text Add to dashboard Cite

Thermal diffusivities of MgSiO 3 perovskite (MgPv) and MgSiO 3 perovskite containing 2 wt% Al 2 O 3 (Al-MgPv) were measured at ambient conditions using the micro-spot heating angstrom method.The obtained values of thermal diffusivities of MgPv and Al-MgPv are 2.6 ± 0.1 and 2.4 ± 0.1 mm 2 /s, respectively. Present result for MgPv is much higher than previously reported value of 1.7 mm 2 /s. Substitution of aluminum into MgPv has little effect on its thermal diffusivity at ambient conditions, and such an impurity effect would remain insignificant at high pressures and high temperatures corresponding to the Earth's lower mantle.

show abstract

“…Recently, there has been a great deal of experimental and theoretical activity in determining heat transport properties of the mantle minerals123456 as these parameters have been realized to be critically important for geomodels aiming to better understand the Earth's thermal history and geodynamics789. Central to this knowledge is the determination of various energy contributions to the Earth's overall energy balance.…”

mentioning

confidence: 99%

“…The experimental determinations of the lattice thermal conductivities of these materials are numerous1512131415, but limited in pressure and temperature and also in experimental accuracy. Thus, estimates of the thermal conductivity at the conditions of the CMB are based on phenomenological extrapolations1617 and on theoretical first-principle calculations124181920, both of which are not validated experimentally. Moreover, since the major mantle minerals are solid solutions and have mass disorder, their thermal conductivity is greatly affected21.…”

mentioning

confidence: 99%

Effect of mass disorder on the lattice thermal conductivity of MgO periclase under pressure

Dalton

Hsieh

Hohensee

et al. 2013

Sci Rep

View full text Add to dashboard Cite

Thermal conductivity of mantle materials controlling the heat balance and thermal evolution of the Earth remains poorly constrained as the available experimental and theoretical techniques are limited in probing minerals under the relevant conditions. We report measurements of thermal conductivity of MgO at high pressure up to 60 GPa and 300 K via diamond anvil cells using the time-domain thermoreflectance technique. These measurements are complemented by model calculations which take into account the effect of temperature and mass disorder of materials within the Earth. Our model calculations agree with the experimental pressure dependencies at 300 and 2000 K for MgO. Furthermore, they predict substantially smaller pressure dependence for mass disordered materials as the mechanism of scattering changes. The calculated thermal conductivity at the core-mantle boundary is smaller than the majority of previous predictions resulting in an estimated total heat flux of 10.4 TW, which is consistent with modern geomodeling estimates.

show abstract

Thermal Conductivity of Periclase (MgO) from First Principles

Cited by 134 publications

References 31 publications

Lattice thermal conductivity of lower mantle minerals and heat flux from Earth’s core

Lattice thermal conductivity of lower mantle minerals and heat flux from Earth’s core

Thermal diffusivities of MgSiO3 and Al-bearing MgSiO3 perovskites

Effect of mass disorder on the lattice thermal conductivity of MgO periclase under pressure

Contact Info

Product

Resources

About