5:30 PM - 5:45 PM
[SIT03-13] Toward the unified image of the spin transition of iron in the lower mantle
Keywords:spin transition of iron, ferric iron, Mg-perovskite, post-Mg-perovskite, Al content, cation exchange reaction
On the other hand, with the spin transition of Fe3+ there are still large discrepancies among the reports, particularly related to the Al content involved in Pv and PPv. Some experimental results indicate that Fe3+ becomes low spin (LS) at the octahedral site (B site) in Al-bearing Pv (above ca. 70 GPa) and PPv (whole stability region) (Catalli et al., 2011; Fujino et al., 2012, 2013), while other experimental results indicate that Fe3+ coexisting with Fe2+ at the A site prefers to occupy the A site and remains HS even at high pressure (Mao et al., 2014; Dorfman et al., 2014). Meanwhile first-principles calculations indicate that Fe3+ remains HS at the A site in Al-bearing Pv and PPv (Hsu et al., 2012).
In the presentation, the possible explanations to resolve the above discrepancies among the previous reports to obtain the unified image of the spin transition of iron in the lower mantle minerals are proposed.