Isothermal equation of state and phase stability of Fe5Si3 up to 96 GPa and 3000 K

McGuire, C.; Santamaria-Pérez, D.; Makhluf, A.; Kavner, A.

doi:10.1002/2017JB014136

Title: Isothermal equation of state and phase stability of Fe₅Si₃ up to 96 GPa and 3000 K

Journal Article · Mon May 29 00:00:00 EDT 2017 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1002/2017JB014136· OSTI ID:1474279

^[1]; Santamaria-Pérez, D. ^[2]; Makhluf, A. ^[1];

^[1]

Univ. of California, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States); Univ. de Valencia, Valencia (Spain)

Here, the composition of Earth's core has first–order implications for understanding the thermal and chemical history of the deep Earth. The present work measures the pressure–volume equation of state of Fe₅Si₃ to 96 GPa in a diamond anvil cell using noble gas pressure media and demonstrates that Fe₅Si₃ is not stable at high temperature and pressure but reappears during thermal quench. The isothermal equation of state at ambient temperature of Fe₅Si₃ is given by the bulk modulus K_T,0 = 167 (8) and K_T,0' = 5.1 (2), with V₀ = 56.29 cm ³ mol^–1. At high temperatures and pressures we observed the disappearance of hexagonal Fe₅Si₃ diffraction peaks and the appearance of peaks corresponding to cubic FeSi and Fe₃Si structures at 18 GPa and at the lowest measurable temperature (~1300 K), indicating that Fe₅Si₃ is not stable at high temperature. Upon temperature quench diffraction peaks corresponding to Fe₅Si₃ reappear, confirming its stability at ambient temperature and high pressure.

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Research Organization:: Univ of Chicago, Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division

Grant/Contract Number:: FG02-94ER14466

OSTI ID:: 1474279

Journal Information:: Journal of Geophysical Research. Solid Earth, Vol. 122, Issue 6; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Title: Isothermal equation of state and phase stability of Fe5Si3 up to 96 GPa and 3000 K

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Title: Isothermal equation of state and phase stability of Fe₅Si₃ up to 96 GPa and 3000 K