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The Thermal Conductivity of Bridgmanite at Lower Mantle Conditions Using a Multi‐Technique Approach

https://doi.org/10.1029/2024JB028823

Edmund, Eric; Chuvashova, Irina; Konôpková, Zuzana; Husband, Rachel; Strohm, Cornelius; Appel, Karen; Bähtz, Carsten; Ball, Orianna; Bouffetier, Victorien; Brugman, Kara; et al (June 2024, Journal of Geophysical Research: Solid Earth)

Abstract The thermal conductivity of bridgmanite, the primary constituent of the Earth's lower mantle, has been investigated using diamond anvil cells at pressures up to 85 GPa and temperatures up to 3,100 K. We report the results of time‐domain optical laser flash heating and X‐ray Free Electron Laser heating experiments from a variety of bridgmanite samples with different Al and Fe contents. The results demonstrate that Fe or Fe,Al incorporation in bridgmanite reduces thermal conductivity by about 50% in comparison to end‐member MgSiO₃at the pressure‐temperature conditions of Earth's lower mantle. The effect of temperature on the thermal conductivity at 28–60 GPa is moderate, well described as , whereais 0.2–0.5. The results yield thermal conductivity of 7.5–15 W/(m × K) in the thermal boundary layer of the lowermost mantle composed of Fe,Al‐bearing bridgmanite.
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Diamond precipitation dynamics from hydrocarbons at icy planet interior conditions

https://doi.org/10.1038/s41550-023-02147-x

Frost, Mungo; McWilliams, R Stewart; Bykova, Elena; Bykov, Maxim; Husband, Rachel J; Andriambariarijaona, Leon M; Khandarkhaeva, Saiana; Massani, Bernhard; Appel, Karen; Baehtz, Carsten; et al (February 2024, Nature Astronomy)

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Thermal conductivity of materials under pressure

https://doi.org/10.1038/s42254-022-00423-9

Zhou, Yan; Dong, Zuo-Yuan; Hsieh, Wen-Pin; Goncharov, Alexander F.; Chen, Xiao-Jia (May 2022, Nature Reviews Physics)

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Radiative thermal conductivity of single-crystal bridgmanite at the core-mantle boundary with implications for thermal evolution of the Earth

https://doi.org/10.1016/j.epsl.2021.117329

Murakami, Motohiko; Goncharov, Alexander F.; Miyajima, Nobuyoshi; Yamazaki, Daisuke; Holtgrewe, Nicholas (January 2022, Earth and Planetary Science Letters)

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Structure and properties of two superionic ice phases

https://doi.org/10.1038/s41567-021-01351-8

Prakapenka, Vitali B.; Holtgrewe, Nicholas; Lobanov, Sergey S.; Goncharov, Alexander F. (November 2021, Nature Physics)

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Contrasting opacity of bridgmanite and ferropericlase in the lowermost mantle: Implications to radiative and electrical conductivity

https://doi.org/10.1016/j.epsl.2021.116871

Lobanov, Sergey S.; Soubiran, François; Holtgrewe, Nicholas; Badro, James; Lin, Jung-Fu; Goncharov, Alexander F. (May 2021, Earth and Planetary Science Letters)
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