Evidence for the charge disproportionation of iron in extraterrestrial bridgmanite
Evidence for the charge disproportionation of iron in extraterrestrial bridgmanite
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DOI：
10.1126/sciadv.aay7893
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发表时间：
2020-01-01
期刊：
影响因子：
13.6
通讯作者：
Xie, Xiande
中科院分区：
文献类型：
--
作者：
Bindi, Luca;Shim, Sang-Heon;Xie, Xiande
Bridgmanite, MgSiO3 with perovskite structure, is considered the most abundant mineral on Earth. On the lower mantle, it contains Fe and Al that strongly influence its behavior. Experimentalists have debated whether iron may exist in a mixed valence state, coexistence of Fe2+ and Fe3+ in bridgmanite, through charge disproportionation. Here, we report the discovery of Fe-rich aluminous bridgmanite coexisting with metallic iron in a shock vein of the Suizhou meteorite. This is the first direct evidence in nature of the Fe disproportionation reaction, which so far has only been observed in some high-pressure experiments. Furthermore, our discovery supports the idea that the disproportionation reaction would have played a key role in redox processes and the evolution of Earth.
