Sturhahn, Wolfgang and Jackson, Jennifer M. and Lin, Jung-Fu (2005) The spin state of iron in minerals of Earth's lower mantle. Geophysical Research Letters, 32 (12). Art. Mo. L12307. ISSN 0094-8276. doi:10.1029/2005GL022802. https://resolver.caltech.edu/CaltechAUTHORS:20130211-114101666
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Abstract
The spin state of Fe(II) and Fe(III) at temperatures and pressures typical for the Earth's lower mantle is discussed. We predict an extended high-spin to low-spin crossover region along the geotherm for Fe-dilute systems depending on crystal-field splitting, pairing energy, and cooperative interactions. In particular, spin transitions in ferromagnesium silicate perovskite and ferropericlase, the dominant lower mantle components, should occur in a wide temperature-pressure range. We also derive a gradual volume change associated with such transitions in the lower mantle. The gradual density changes and the wide spin crossover regions seem incompatible with lower mantle stratification resulting from a spin transition.
| Item Type: | Article | |||||||||
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| Additional Information: | © 2005 by the American Geophysical Union. Article first published online: 23 Jun. 2005. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Contract No. W-31-109-Eng-38. JMJ acknowledges support from NSF EAR-0135642. | |||||||||
| Group: | Seismological Laboratory | |||||||||
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| Issue or Number: | 12 | |||||||||
| DOI: | 10.1029/2005GL022802 | |||||||||
| Record Number: | CaltechAUTHORS:20130211-114101666 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130211-114101666 | |||||||||
| Official Citation: | Sturhahn, W., J. M. Jackson, and J.-F. Lin (2005), The spin state of iron in minerals of Earth’s lower mantle, Geophys. Res. Lett., 32, L12307, doi:10.1029/ 2005GL022802 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 36844 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 25 Feb 2013 23:06 | |||||||||
| Last Modified: | 09 Nov 2021 23:25 |
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