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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.