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Detailed Reference Information |
Sturhahn, W., Jackson, J.M. and Lin, J. (2005). The spin state of iron in minerals of Earth's lower mantle. Geophysical Research Letters 32: doi: 10.1029/2005GL022802. issn: 0094-8276. |
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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. |
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Abstract |
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Keywords
Mineral Physics, High-pressure behavior, Mineral Physics, Physical thermodynamics, Mineral Physics, General or miscellaneous |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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