Инд. авторы:	Ohtani E., Shibazaki Y., Sakai T., Mibe K., Fukui H., Kamada S., Sakamaki T., Seto Y., Tsutsui S., Baron A.Q.R.
Заглавие:	Sound velocity of hexagonal close-packed iron up to core pressures
Библ. ссылка:	Ohtani E., Shibazaki Y., Sakai T., Mibe K., Fukui H., Kamada S., Sakamaki T., Seto Y., Tsutsui S., Baron A.Q.R. Sound velocity of hexagonal close-packed iron up to core pressures // Geophysical Research Letters. - 2013. - Vol.40. - Iss. 19. - P.5089-5094. - ISSN 0094-8276. - EISSN 1944-8007.
Внешние системы:	DOI: 10.1002/grl.50992; SCOPUS: 2-s2.0-84885009024; WoS: 000326311600022;
Реферат:	eng: We determined the compressional velocity of hcp-Fe using high-resolution inelastic X-ray scattering combined with in situ X-ray powder diffraction: Our measurements extend up to 174 GPa at room temperature, to 88 GPa at 700 K, and to 61.5 GPa at 1000 K. Our data, including those obtained at high temperature, are well described by a linear relation to density, extending the range of verification of Birch's law and suggesting only small temperature dependence up to 1000 K. This result, once compared to the preliminary reference Earth model seismologically based model, indicates that there is either a strong temperature effect on Birch's law above 1000 K or the composition of the core is rather different than expected, containing, e.g., heavy impurities. Noting that both recent theoretical calculations and shock wave velocity measurements are consistent with modification of Birch's law at high temperature, we favor the former explanation. Key Points We measured the velocity of hcp-Fe to 174 GPa and 300 K by IXS We confirmed no temperature dependence on Birch's law to 60 GPa and 1000 K We argued the light elements in the inner core based on the present study ©2013. American Geophysical Union. All Rights Reserved.
Ключевые слова:	sound velocity; hcp-iron; Hexagonal close-packed irons; High pressure; Inelastic X ray scattering; Inner core; Preliminary reference earth models; Situ X-ray powder diffraction; Theoretical calculations; Chemical elements; Temperature distribution; Wave propagation; X ray powder diffraction; X ray scattering; X rays; Acoustic wave velocity; high pressure; high temperature; inner core; iron; sound velocity; temperature effect; X-ray diffraction; inelastic X-ray scattering; high pressure; inner core; hcp-iron;
Издано:	2013
Физ. характеристика:	с.5089-5094