Bibliographie

Science, 288, pp. 1626-1629, (2000) [doi: 10.1126/science.288.5471.1626]

Raman spectroscopy of Iron to 152 Gigapascals: Implications for Earth's Inner Core

S. Merkel, A.F. Goncharov, H.K. Mao, P. Gillet and R.J. Hemley

Raman spectra of hexagonally closed packed iron (e-Fe) have been measured from 15 to 152 gigapascals using diamond-anvil cells with ultrapure synthetic diamond anvils. The results give a Grneisen parameter g0 = 1.68 (+/-0.20) and q = 0.7 (+/-0.5). Phenomenological modeling shows that the Raman-active mode can be approximately correlated with an acoustic phonon and thus provides direct information on the high pressure elastic properties of iron, which have been controversial. In particular, the C₄₄ elastic modulus is found lower than previous determinations. This leads to changes of about 35% at core pressures for shear wave anisotropies.

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