Lattice Thermal Conductivity of MgSiO<sub>3</sub> Postperovskite Under the Lowermost Mantle Conditions From Ab Initio Anharmonic Lattice Dynamics

DOI Web Site Web Site Web Site 被引用文献7件 参考文献48件

書誌事項

公開日
2019-11-25
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2019gl085273
公開者
American Geophysical Union (AGU)

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<jats:title>Abstract</jats:title><jats:p>The lattice thermal conductivity (<jats:styled-content><jats:italic>κ</jats:italic><jats:sub>lat</jats:sub></jats:styled-content>) of MgSiO<jats:sub>3</jats:sub> postperovskite (Mg‐PPv) under the lowermost mantle pressure (<jats:italic>P</jats:italic>) and temperature (<jats:italic>T</jats:italic>) conditions was calculated using density functional theory combining anharmonic lattice dynamics theory. The <jats:styled-content><jats:italic>κ</jats:italic><jats:sub>lat</jats:sub></jats:styled-content> of Mg‐PPv was found to be ~50% higher than that of MgSiO<jats:sub>3</jats:sub> bridgmanite (Mg‐Brg) owing to the larger phonon group velocity and lifetime. The lateral variation in the core‐mantle boundary heat flux (<jats:styled-content><jats:italic>q</jats:italic><jats:sub>CMB</jats:sub></jats:styled-content>) can be enhanced by the Brg‐PPv phase transition. We also found that the <jats:styled-content><jats:italic>κ</jats:italic><jats:sub>lat</jats:sub></jats:styled-content> along the <jats:italic>c</jats:italic> axis of Mg‐PPv is close to the conductivity of isotropic aggregate. This suggests that the effect of anisotropy in the <jats:styled-content><jats:italic>κ</jats:italic><jats:sub>lat</jats:sub></jats:styled-content> on <jats:styled-content><jats:italic>q</jats:italic><jats:sub>CMB</jats:sub></jats:styled-content> would be minor if the transversely isotropic aggregate with the <jats:italic>c</jats:italic> axis vertical alignment, a potential source of seismic anisotropy in the D″ layer, is developed.</jats:p>

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