Thermal conductivity of MgO in giant planetary interior conditions predicted by deep potential
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929714469273600 |
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| author | Qiu, Rong Zeng, Qiyu Chen, Ke Yu, Xiaoxiang Dai, Jiayu |
| author_facet | Qiu, Rong Zeng, Qiyu Chen, Ke Yu, Xiaoxiang Dai, Jiayu |
| contents | Thermal conductivity $κ$ of MgO plays a fundamental role in understanding the thermal evolution and mantle convection in the interior of terrestrial planets. However, previous theoretical calculations deviate from each other and the $κ$ of high-pressure B2 phase remains undetermined. Here, by combining molecular dynamics and deep potential trained with first-principles data, we systematically investigate the $κ$ of MgO from ambient state to the core-mantle boundary (CMB) of super-Earth with $5M_{\oplus}$. We point out the significance of 4-phonon scatterings and modify the conventional thermal conductivity model of MgO by considering the density-dependent proportion of 3-phonon and 4-phonon scatterings. The $κ$ profiles of MgO in Earth and super-Earth are further estimated. For super-Earth, we predict a significant reduction of $κ$ at the B1-B2 phase transition area near the CMB. This work provides new insights into thermal transport under extreme conditions and an improved thermal model for terrestrial planets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_18876 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Thermal conductivity of MgO in giant planetary interior conditions predicted by deep potential Qiu, Rong Zeng, Qiyu Chen, Ke Yu, Xiaoxiang Dai, Jiayu Earth and Planetary Astrophysics Disordered Systems and Neural Networks Computational Physics Thermal conductivity $κ$ of MgO plays a fundamental role in understanding the thermal evolution and mantle convection in the interior of terrestrial planets. However, previous theoretical calculations deviate from each other and the $κ$ of high-pressure B2 phase remains undetermined. Here, by combining molecular dynamics and deep potential trained with first-principles data, we systematically investigate the $κ$ of MgO from ambient state to the core-mantle boundary (CMB) of super-Earth with $5M_{\oplus}$. We point out the significance of 4-phonon scatterings and modify the conventional thermal conductivity model of MgO by considering the density-dependent proportion of 3-phonon and 4-phonon scatterings. The $κ$ profiles of MgO in Earth and super-Earth are further estimated. For super-Earth, we predict a significant reduction of $κ$ at the B1-B2 phase transition area near the CMB. This work provides new insights into thermal transport under extreme conditions and an improved thermal model for terrestrial planets. |
| title | Thermal conductivity of MgO in giant planetary interior conditions predicted by deep potential |
| topic | Earth and Planetary Astrophysics Disordered Systems and Neural Networks Computational Physics |
| url | https://arxiv.org/abs/2310.18876 |