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Measurements of the Lamb-Moessbauer factor at simultaneous high-pressure-temperature conditions and estimates of the equilibrium isotopic fractionation of iron

Dongzhou Zhang, Jennifer M. Jackson, Wolfgang Sturhahn, Jiyong Zhao, E. Ercan Alp and Michael Y. Hu
Measurements of the Lamb-Moessbauer factor at simultaneous high-pressure-temperature conditions and estimates of the equilibrium isotopic fractionation of iron
American Mineralogist (March 2022) 107 (3): 421-431

Abstract

Isotopic fractionation has been linked to the lattice vibrations of materials through their phonon spectra. The Lamb-Mossbauer factor (fLM) has the potential to provide information about the lattice vibrations in materials. We constrain the temperature evolution of the fLM of gamma - and epsilon -Fe at in situ high-P-T conditions between 1650 K and the melting point. We find that the vibrations of gamma - and epsilon -Fe can be described using a quasiharmonic model with a pressure- and temperature-dependent Debye temperature computed from the measured fLM. From the Debye temperature, we derive the equilibrium isotopic fractionation beta -factor of iron. Our results show that the quasiharmonic behavior of metallic iron would lower the value of lnbeta (sub Fe) (super 57/54) by 0.1 ppm at 1600-2800 K and 50 GPa when compared to the extrapolation of room temperature nuclear resonant inelastic X-ray scattering data. Our study suggests that anharmonicity may be more prevalent in Fe metal than in lower mantle minerals at 2800 K and 50 GPa, a relevant condition for the core formation, and the silicate mantle may be isotopically heavy in iron.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 107
Serial Issue: 3
Title: Measurements of the Lamb-Moessbauer factor at simultaneous high-pressure-temperature conditions and estimates of the equilibrium isotopic fractionation of iron
Affiliation: University of Hawaii at Manoa, Hawaii Institute of Geophysics and Planetology, Honolulu, HI, United States
Pages: 421-431
Published: 20220301
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 101
Accession Number: 2022-018335
Categories: Isotope geochemistryGeophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: California Institute of Technology, USA, United StatesArgonne National Laboratory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2022
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