Iron spin crossover in ferropericlase and its effect on lower-mantle thermal conductivity
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Goncharov, Alexander F. Chuvashova, Irina Edmund, Eric Lin, JungFu Younes, Zena Jaisle, Nicolas Phelipeau, Axel Sanchez-Valle, Carmen Otzen, Christoph Prescher, Clemens Liermann, Hanns-Peter Giordano, Nico McHardy, James Appel, Karen Andrzejewski, Michal Rahul, S. V. Tang, Minxue Sztuk-Dambietz, Jolanta Michelat, Thomas Laurus, Torsten McMahon, Malcolm Robertson, Mark Husband, Rachel Kolesnikov, Efim Merkel, Sebastien Boccato, Silvia Baehtz, Carsten Morard, Guillaume Bullock, Emma S. Strohm, Cornelius Konopkova, Zuzana McWilliams, Ryan Stewart |
| author_facet | Goncharov, Alexander F. Chuvashova, Irina Edmund, Eric Lin, JungFu Younes, Zena Jaisle, Nicolas Phelipeau, Axel Sanchez-Valle, Carmen Otzen, Christoph Prescher, Clemens Liermann, Hanns-Peter Giordano, Nico McHardy, James Appel, Karen Andrzejewski, Michal Rahul, S. V. Tang, Minxue Sztuk-Dambietz, Jolanta Michelat, Thomas Laurus, Torsten McMahon, Malcolm Robertson, Mark Husband, Rachel Kolesnikov, Efim Merkel, Sebastien Boccato, Silvia Baehtz, Carsten Morard, Guillaume Bullock, Emma S. Strohm, Cornelius Konopkova, Zuzana McWilliams, Ryan Stewart |
| contents | Thermal conductivity of Earths lower mantle controls heat transfer across the core-mantle boundary (CMB) and strongly influences mantle convection. We report direct measurements of the thermal conductivity of single-crystal ferropericlase (Mg$_{1-x}$Fe$_x$O, $x = 0.09$-0.13), the second most abundant lower-mantle mineral, using optical laser flash and X-ray free-electron laser heating in diamond-anvil cells up to $\sim2200$~K and 130~GPa. These experiments provide the first conductivity data for ferropericlase at simultaneous lower-mantle pressures and temperatures. A marked reduction in conductivity between 60 and 100~GPa at $\sim1700$~K is consistent with the iron spin crossover. Combined with our previous results for Fe- and Fe,Al-bearing bridgmanite, the data define a lower-mantle conductivity profile that increases with pressure to $\sim10$~W\,m$^{-1}$\,K$^{-1}$ near the CMB, constraining mantle heat flux, plume buoyancy, and long-term geodynamic evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_14183 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Iron spin crossover in ferropericlase and its effect on lower-mantle thermal conductivity Goncharov, Alexander F. Chuvashova, Irina Edmund, Eric Lin, JungFu Younes, Zena Jaisle, Nicolas Phelipeau, Axel Sanchez-Valle, Carmen Otzen, Christoph Prescher, Clemens Liermann, Hanns-Peter Giordano, Nico McHardy, James Appel, Karen Andrzejewski, Michal Rahul, S. V. Tang, Minxue Sztuk-Dambietz, Jolanta Michelat, Thomas Laurus, Torsten McMahon, Malcolm Robertson, Mark Husband, Rachel Kolesnikov, Efim Merkel, Sebastien Boccato, Silvia Baehtz, Carsten Morard, Guillaume Bullock, Emma S. Strohm, Cornelius Konopkova, Zuzana McWilliams, Ryan Stewart Geophysics Materials Science Thermal conductivity of Earths lower mantle controls heat transfer across the core-mantle boundary (CMB) and strongly influences mantle convection. We report direct measurements of the thermal conductivity of single-crystal ferropericlase (Mg$_{1-x}$Fe$_x$O, $x = 0.09$-0.13), the second most abundant lower-mantle mineral, using optical laser flash and X-ray free-electron laser heating in diamond-anvil cells up to $\sim2200$~K and 130~GPa. These experiments provide the first conductivity data for ferropericlase at simultaneous lower-mantle pressures and temperatures. A marked reduction in conductivity between 60 and 100~GPa at $\sim1700$~K is consistent with the iron spin crossover. Combined with our previous results for Fe- and Fe,Al-bearing bridgmanite, the data define a lower-mantle conductivity profile that increases with pressure to $\sim10$~W\,m$^{-1}$\,K$^{-1}$ near the CMB, constraining mantle heat flux, plume buoyancy, and long-term geodynamic evolution. |
| title | Iron spin crossover in ferropericlase and its effect on lower-mantle thermal conductivity |
| topic | Geophysics Materials Science |
| url | https://arxiv.org/abs/2604.14183 |