Инд. авторы:	Hamada M., Kamada S., Ohtani E., Mitsui T., Masuda R., Sakamaki T., Suzuki N., Maeda F., Akasaka M.
Заглавие:	Magnetic and spin transitions in wüstite: A synchrotron Mössbauer spectroscopic study
Библ. ссылка:	Hamada M., Kamada S., Ohtani E., Mitsui T., Masuda R., Sakamaki T., Suzuki N., Maeda F., Akasaka M. Magnetic and spin transitions in wüstite: A synchrotron Mössbauer spectroscopic study // Physical Review B: Condensed Matter and Materials Physics. - 2016. - Vol.93. - Iss. 15. - Art.155165. - ISSN 1098-0121. - EISSN 1550-235X.
Внешние системы:	DOI: 10.1103/PhysRevB.93.155165; РИНЦ: 27151062; SCOPUS: 2-s2.0-84964659777; WoS: 000374949000003;
Реферат:	eng: This is a Mössbauer study of wüstite at pressures above 200 GPa using synchrotron Mössbauer spectroscopy. Synthetic Fe0.96O-wüstite 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 Mössbauer 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. © 2016 American Physical Society.
Издано:	2016
Физ. характеристика:	155165
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