NDLI: Sound velocity and elastic properties of Fe–Ni and Fe–Ni

Content Provider	Springer Nature Link
Author	Kuwabara, Soma Terasaki, Hideri Nishida, Keisuke Shimoyama, Yuta Takubo, Yusaku Higo, Yuji Shibazaki, Yuki Urakawa, Satoru Uesugi, Kentaro Takeuchi, Akihisa Kondo, Tadashi
Copyright Year	2015
Abstract	The sound velocity (V P) of liquid Fe–10 wt% Ni and Fe–10 wt% Ni–4 wt% C up to 6.6 GPa was studied using the ultrasonic pulse-echo method combined with synchrotron X-ray techniques. The obtained V P of liquid Fe–Ni is insensitive to temperature, whereas that of liquid Fe–Ni–C tends to decrease with increasing temperature. The V P values of both liquid Fe–Ni and Fe–Ni–C increase with pressure. Alloying with 10 wt% of Ni slightly reduces the V P of liquid Fe, whereas alloying with C is likely to increase the V P. However, a difference in V P between liquid Fe–Ni and Fe–Ni–C becomes to be smaller at higher temperature. By fitting the measured V P data with the Murnaghan equation of state, the adiabatic bulk modulus (K S0) and its pressure derivative (K S ′ ) were obtained to be K S0 = 103 GPa and K S ′ = 5.7 for liquid Fe–Ni and K S0 = 110 GPa and K S ′ = 7.6 for liquid Fe–Ni–C. The calculated density of liquid Fe–Ni–C using the obtained elastic parameters was consistent with the density values measured directly using the X-ray computed tomography technique. In the relation between the density (ρ) and sound velocity (V P) at 5 GPa (the lunar core condition), it was found that the effect of alloying Fe with Ni was that ρ increased mildly and V P decreased, whereas the effect of C dissolution was to decrease ρ but increase V P. In contrast, alloying with S significantly reduces both ρ and V P. Therefore, the effects of light elements (C and S) and Ni on the ρ and V P of liquid Fe are quite different under the lunar core conditions, providing a clue to constrain the light element in the lunar core by comparing with lunar seismic data.
Starting Page	229
Ending Page	236
Page Count	8
File Format	PDF
ISSN	03421791
Journal	Physics and Chemistry of Minerals
Volume Number	43
Issue Number	3
e-ISSN	14322021
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-12-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sound velocity Density Fe-alloy Liquid High pressure Mineralogy Crystallography Geochemistry Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Materials Science

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