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  Non‐isotropic contraction and expansion of samples in diamond anvil cells: Implications for thermal conductivity at the core‐mantle boundary

Lobanov, S. S. (2022 online): Non‐isotropic contraction and expansion of samples in diamond anvil cells: Implications for thermal conductivity at the core‐mantle boundary. - Geophysical Research Letters.
https://doi.org/10.1029/2022GL100379

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Lobanov, S. S.1, Autor              
Affiliations:
13.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146036              

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Schlagwörter: DEAL Wiley
 Zusammenfassung: The thermal conductivities of mantle and core materials have a major impact on planetary evolution, but their experimental determination requires precise knowledge of sample thickness at high pressure. Despite its importance, thickness in most diamond anvil cell experiments is not measured but inferred from equations of state, assuming isotropic contraction upon compression or assuming isotropic expansion upon decompression. Here we provide evidence that in diamond anvil cell experiments both assumptions are invalid for a range of mechanically diverse materials (KCl, NaCl, Ar, MgO, silica glass, Al2O3). Upon compression, these samples are ∼30-50% thinner than expected from isotropic contraction. Most surprisingly, all the studied samples continue to thin upon decompression to 10-20 GPa. Our results partially explain some discrepancies among the highly controversial thermal conductivity values of iron at Earth’s core conditions. More generally, we suggest that in situ characterization of sample geometry is essential for conductivity measurements at high pressure.

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 Datum: 2022
 Publikationsstatus: Online veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1029/2022GL100379
OATYPE: Hybrid - DEAL Wiley
GFZPOF: p4 T3 Restless Earth
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Titel: Geophysical Research Letters
Genre der Quelle: Zeitschrift, SCI, Scopus, ab 2023 oa
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: - Artikelnummer: - Start- / Endseite: - Identifikator: ISSN: 1944-8007
ISSN: 0094-8276
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals182
Publisher: American Geophysical Union (AGU)
Publisher: Wiley