Abstract
The effect of ferric iron on the properties of Mg-silicate post-perovskite (PPv) were studied up to 138 GPa using synchrotron X-ray diffraction and Mossbauer spectroscopy. Our diffraction measurements revealed that the incorporation of Fe 3+ has virtually no effect on the volume of PPv, in contrast to Fe 2+ , which increases the volume. Therefore, incorporation of Fe 3+ increases the density of PPv much more effectively than Fe 2+ . Mossbauer spectroscopy suggests that Fe 3+ enters PPv through charge-coupled substitution and is high spin in the bipolar prismatic site and low spin in the octahedral site (i.e., mixed spin state). Our results may have important implications for the gravitational stability of lower-mantle heterogeneities.
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