| Title | Ab initio calculations on thermal conductivity of Fe-Ni-O fluid: Constraints on the thermal evolution of Earth's core |
| Authors | Li, Wei-Jie Li, Zi He, Xian-Tu Ma, Zhe Fu, Zhen-Guo Lu, Yong Wang, Cong Zhang, Ping |
| Affiliation | Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China Second Acad CASIC, X LAB, Beijing 100854, Peoples R China Peking Univ, Ctr Appl Phys & Technol, Beijing 100871, Peoples R China Beijing Univ Chem Technol, Coll Math & Phys, Beijing 100029, Peoples R China |
| Keywords | ELECTRICAL-RESISTIVITY IRON ALLOYS STRATIFICATION POTASSIUM OXYGEN DYNAMO MODEL |
| Issue Date | 1-Jul-2022 |
| Publisher | EARTH AND PLANETARY SCIENCE LETTERS |
| Abstract | Thermal conductivity is a crucial parameter for the thermal evolution of Earth's core. In this paper, the thermal conductivity of Fe-Ni-O fluid was calculated by ab initio simulations, and then age of inner core and thickness of thermal stratification were derived. The results indicate that the thermal conductivity of Fe-Ni-O fluid along the core adiabatic curve ranges from 111.68 to 182.33 W/m/K. The thermal conductivity at the core-mantle boundary increases monotonically with temperature as expected. The thermal conductivity of Fe-Ni-O fluid is lower than that of pure Fe and Fe-Ni fluids. The age of the inner core is determined to be 0.868 Ga in our fiducial model by calculating the energy budget in the core and time evolution of thermal conductivity of Fe-Ni-O fluid. The thickness of thermal stratification is 454 km when dT(c)/dt=100 K/Ga by calculating the temperature gradient. (C) 2022 Published by Elsevier B.V. |
| URI | http://hdl.handle.net/20.500.11897/649782 |
| ISSN | 0012-821X |
| DOI | 10.1016/j.epsl.2022.117581 |
| Indexed | SCI(E) |
| Appears in Collections: | 工学院 |
