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Reduced charge transfer in mixed-spin ferropericlase inferred from its high-pressure refractive index

Authors
/persons/resource/lschiff

Schifferle,  Lukas
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/speziale

Speziale,  S.
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Winkler,  Björn
External Organizations;

Milman,  Victor
External Organizations;

/persons/resource/slobanov

Lobanov,  Sergey
3.6 Chemistry and Physics of Earth Materials, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Schifferle, L., Speziale, S., Winkler, B., Milman, V., Lobanov, S. (2023 online): Reduced charge transfer in mixed-spin ferropericlase inferred from its high-pressure refractive index. - American Mineralogist.
https://doi.org/10.2138/am-2023-9100


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5022869
Abstract
Physical properties of mantle minerals are essential for comprehensive geodynamic modelling. High-pressure experiments allow measurements of physical properties but fundamental insights into their evolution with pressure are often experimentally inaccessible. Here we report the first in situ experimental determination of the optical refractive index, its wavelength-dispersion, and optical absorption coefficient of ferropericlase up to ~140 GPa at room temperature. All these properties change gradually in dominantly high-spin (below ~50 GPa) and low-spin (above ~80 GPa) ferropericlase. However, in the mixed-spin state (i.e., significant presence of both high- and low-spin iron), the index dispersion and the absorption coefficient decrease by a factor of three and ~30 %, respectively. These anomalies suggest that charge transport by small polaron is reduced in mixed-spin ferropericlase, providing fundamental insights into the factor-of-three lower electrical conductivity of ferropericlase at ~50-70 GPa.