Correction to “Experimental vibrational Grüneisen ratio values for ε‐iron up to 330 GPa at 300 K”

Abstract

Experimental values for the vibrational Grüneisen ratio, γυ, for hexagonal close-packed (hcp) iron, called epsilon (ϵ)-iron, were obtained over a large compression range corresponding to Earth’s inner-core pressure. This was done by measuring the intensity change in x-ray diffraction lines under pressure, P. X-ray structural refinement using the Rietveld method on powder diffraction data yielded information on mean square displacement used to obtain the Debye temperature, θ, as a function of compression, V/V 0. The value of θ was determined from the measured intensity of the diffraction lines, which arises from the mean squared amplitude measured in-situ in the diamond cell. From the Debye relationship, γυ = - (∂lnθ/∂lnV) T , we determined experimental data on γυ versus V of Fe (hcp) up to 330 GPa at 300 K. The measured value of γυ(V) is 1.18 at 330 GPa and 1.41 at 135 GPa.