@article{oai:repo.qst.go.jp:00047980,
 author = {Hamada, Maki and Kamada, Seiji and Ohtani, Eiji and Mitsui, Takaya and Masuda, Ryo and Sakamaki, Tatsuya and Suzuki, Nanami and Maeda, Fumiya and Akasaka, Masahide and 三井 隆也},
 journal = {Physical Review B},
 month = {Apr},
 note = {This is a Mossbauer study of wustite at pressures above 200 GPa using synchrotron Mossbauer spectroscopy. Synthetic Fe 0.96 O-wustite was  investigated at 91(2), 95(4), 109(2), 114.5(3), 131.1(7), 133.2(2), 155(2), 167(2),
193(2) and 203(1) GPa at 300 K at the SPring-8 BL11XU beamline. The Mossbauer spectrum at 91 GPa consists of both magnetic and nonmagnetic components. The magnetic high-spin component decreases gradually with
increasing pressure from 91 to 203 GPa, while the nonmagnetic low-spin component increases with pressure in the same pressure range. The result suggests that the spin state of Fe in the outer core at pressures above
203 GPa is the low-spin state. If oxygen exists in the core, the low-spin Fe-O bonding is shorter than high-spin Fe-O bonding, suggesting dense Fe-O liquid in the Earth’s outer core. The gradual increase of the density of the metallic liquid with depth by the spin transition of Fe-O bonding in the shallow outer core region will stabilize the outer core against thermal convection.},
 pages = {155165-1--155165-6},
 title = {Magnetic and spin transitions in wüstite: A synchrotron Mössbauer spectroscopic study},
 volume = {93},
 year = {2016}
}