Spin transition of iron in magnesiowüstite in the Earth's lower mantle

Jung-Fu Lin (), Viktor V. Struzhkin, Steven D. Jacobsen, Michael Y. Hu, Paul Chow, Jennifer Kung, Haozhe Liu, Ho-kwang Mao and Russell J. Hemley
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Jung-Fu Lin: Carnegie Institution of Washington
Viktor V. Struzhkin: Carnegie Institution of Washington
Steven D. Jacobsen: Carnegie Institution of Washington
Michael Y. Hu: Argonne National Laboratory
Paul Chow: Argonne National Laboratory
Jennifer Kung: University of New York at Stony Brook
Haozhe Liu: Argonne National Laboratory
Ho-kwang Mao: Carnegie Institution of Washington
Russell J. Hemley: Carnegie Institution of Washington

Nature, 2005, vol. 436, issue 7049, 377-380

Abstract: Abstract Iron is the most abundant transition-metal element in the mantle and therefore plays an important role in the geochemistry and geodynamics of the Earth's interior1,2,3,4,5,6,7,8,9,10,11. Pressure-induced electronic spin transitions of iron occur in magnesiowüstite, silicate perovskite and post-perovskite1,2,3,4,8,10,11. Here we have studied the spin states of iron in magnesiowüstite and the isolated effects of the electronic transitions on the elasticity of magnesiowüstite with in situ X-ray emission spectroscopy and X-ray diffraction to pressures of the lowermost mantle. An observed high-spin to low-spin transition of iron in magnesiowüstite results in an abnormal compressional behaviour between the high-spin and the low-spin states. The high-pressure, low-spin state exhibits a much higher bulk modulus and bulk sound velocity than the low-pressure, high-spin state; the bulk modulus jumps by ∼35 per cent and bulk sound velocity increases by ∼15 per cent across the transition in (Mg0.83,Fe0.17)O. Although no significant density change is observed across the electronic transition, the jump in the sound velocities and the bulk modulus across the transition provides an additional explanation for the seismic wave heterogeneity in the lowermost mantle12,13,14,15,16,17,18,19,20,21. The transition also affects current interpretations of the geophysical and geochemical models using extrapolated or calculated thermal equation-of-state data without considering the effects of the electronic transition5,6,22,23.

Date: 2005
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DOI: 10.1038/nature03825

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