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

  • Lukas Schifferle , Sergio Speziale , Björn Winkler , Victor Milman und Sergey S. Lobanov ORCID logo EMAIL logo
Veröffentlicht/Copyright: 9. Juli 2024
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 109 Heft 7

Abstract

Physical properties of mantle minerals are essential for comprehensive geodynamic modeling. 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.

Keywords: High-pressure; diamond anvil cell; refractive index; ferropericlase; MgO; DFT; spin transition; band gap; electrical conductivity; Physics and Chemistry of Earth’s Deep Mantle and Core

† Special collection papers can be found online at our website in the Special Collection section.

Acknowledgments and Funding

This work was supported by the Helmholtz Young Investigators Group CLEAR (VH-NG-1325). We thank Brent Grocholski and Leonid Dubrovinsky for donating ferropericlase samples (Fp13 and Fp24, respectively) and specifically Caterina Melai for the synthesis of Fp24. We are grateful to Anja Schreiber for her technical support with thickness measurements of the decompressed sample. B.W. is grateful for support through the BIOVIA Science ambassador program. Last but not least, we are grateful to the reviewers and editor who helped to improve this manuscript.

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Received: 2023-06-16
Accepted: 2023-10-10
Published Online: 2024-07-09
Published in Print: 2024-07-26

© 2024 by Mineralogical Society of America

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https://doi.org/10.2138/am-2023-9100
Schlagwörter für diesen Artikel
High-pressure; diamond anvil cell; refractive index; ferropericlase; MgO; DFT; spin transition; band gap; electrical conductivity; Physics and Chemistry of Earth’s Deep Mantle and Core

Artikel in diesem Heft

  1. Reduced charge transfer in mixed-spin ferropericlase inferred from its high-pressure refractive index
  2. Stability of magnesite in the presence of hydrous fluids up to 12 GPa: Insights into subduction zone processes and carbon cycling in the Earth’s mantle
  3. Influence of Fe(II), Fe(III), and Al(III) isomorphic substitutions on acid-base properties of edge surfaces of cis-vacant montmorillonite: Insights from first-principles molecular dynamics simulations and surface complexation modeling
  4. The kinetic effect induced by variable cooling rate on the crystal-chemistry of spinel in basaltic systems revealed by EPMA mapping
  5. Machine-learning oxybarometer developed using zircon trace-element chemistry and its applications
  6. Experimental determination of Si, Mg, and Ca isotope fractionation during enstatite melt evaporation
  7. Quartz texture and the chemical composition fingerprint of ore-forming fluid evolution at the Bilihe porphyry Au deposit, NE China
  8. Zhengminghuaite, Cu6Fe3As4S12, a new sulfosalt mineral from the Zimudang Carlin-type gold deposit in southwestern Guizhou, China
  9. Magmatic degassing and fluid metasomatism promote compositional variation from I-type to peralkaline A-type granite in the late Cretaceous Fuzhou felsic complex, SE China
  10. The new mineral cuprozheshengite, Pb4CuZn2(AsO4)2(PO4)2(OH)2, from Yunnan, China, with site-selective As-P substitution
  11. A neutron diffraction study of the hydrous borate inderborite, CaMg[B3O3(OH)5]2(H2O)4·2H2O
  12. Bobfinchite, Na[(UO2)8O3(OH)11]·10H2O, a new Na-bearing member of the schoepite family
  13. Kenorozhdestvenskayaite-(Fe), Ag6(Ag4Fe2)Sb4S12□: A new tetrahedrite group mineral containing a natural [Ag6]4+ cluster and its relationship to the synthetic ternary phosphide (Ag6M4P12) M6′
  14. Compressibility and pressure-induced structural evolution of kokchetavite, hexagonal polymorph of KAlSi3O8, by single-crystal X-ray diffraction
  15. Local strain heterogeneity associated with Al/Si ordering in anorthite, CaAl2Si2O8, with implications for thermodynamic mixing behavior and trace element partitioning in plagioclase feldspars
  16. Letter
  17. The glass transition temperature of anhydrous amorphous calcium carbonate
  18. Book Review
  19. Book Review: Introduction to Mineralogy
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Heruntergeladen am 19.9.2025 von https://www.degruyterbrill.com/document/doi/10.2138/am-2023-9100/html
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