May 22, 2014
- Assistant Professor Andre Mkhoyan, CEMS postdoctoral fellow Jong Seok Jeong, and graduate student Andrew Wagner are part of a collaborative team that recently discovered a new, iron-rich silicate phase that may be a major component of the lowermost ~700 km of Earth's mantle. The group found that [(Mg,Fe)SiO3] perovskite is unstable under the conditions of Earth's lower mantle (at approximately 100 GPa pressure and 2300 K temperature), loses its Fe, and disproportionates to a nearly Fe-free MgSiO3 perovskite and new Fe-rich phase with hexagonal crystal structure. The work titled, â€œDisproportionation of (Mg,Fe)SiO3 perovskite in Earthâ€TMs deep lower mantleâ€? was recently published in Science magazine.
The research team also consists of Dr. Ho-kwang "Dave" Mao's group at the Carnegie Institution for Science and colleagues at Stanford University and Argonne National Laboratory.
In that same journal issue, Prof. Quentin Williams of UC-Santa Cruz provides commentary on their research:
Related Link: http://www.sciencemag.org/content/344/6186/877.full