Sound Velocities in Iron to 110 Gigapascals-Reference-Cited by-同舟云学术

Sound Velocities in Iron to 110 Gigapascals

Published:2001-01-19 Issue:5503 Volume:291 Page:468-471
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Fiquet Guillaume¹,Badro James¹,Guyot François¹,Requardt Herwig²,Krisch Michael²

Affiliation:

1. Laboratoire de Minéralogie et Cristallographie, UMR CNRS 7590, Université Paris VI, 4 Place Jussieu, 75252 Paris cedex 06, France.

2. European Synchrotron Radiation Facility, BP220, 38043 Grenoble cedex, France.

Abstract

The dispersion of longitudinal acoustic phonons was measured by inelastic x-ray scattering in the hexagonal closed-packed (hcp) structure of iron from 19 to 110 gigapascals. Phonon dispersion curves were recorded on polycrystalline iron compressed in a diamond anvil cell, revealing an increase of the longitudinal wave velocity ( V P ) from 7000 to 8800 meters per second. We show that hcp iron follows a Birch law for V P , which is used to extrapolate velocities to inner core conditions. Extrapolated longitudinal acoustic wave velocities compared with seismic data suggest an inner core that is 4 to 5% lighter than hcp iron.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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