In:
Physics and Chemistry of Minerals, Springer Science and Business Media LLC, Vol. 50, No. 3 ( 2023-09)
Abstract:
Fe–Ni–S–Si alloy is considered to be one of the plausible candidates of Mercury core material. Elastic properties of Fe–Ni–S–Si liquid are important to reveal the density profile of the Mercury core. In this study, we measured the P-wave velocity ( V P ) of Fe–Ni–S–Si (Fe 73 Ni 10 S 10 Si 7 , Fe 72 Ni 10 S 5 Si 13 , and Fe 67 Ni 10 S 10 Si 13 ) liquids up to 17 GPa and 2000 K to study the effects of pressure, temperature, and multiple light elements (S and Si) on the V P and elastic properties. The V P of Fe–Ni–S–Si liquids are less sensitive to temperature. The effect of pressure on the V P are close to that of liquid Fe and smaller than those of Fe–Ni–S and Fe–Ni–Si liquids. Obtained elastic properties are K S0 = 99.1(9.4) GPa, K S ’ = 3.8(0.1) and ρ 0 =6.48 g/cm 3 for S-rich Fe 73 Ni 10 S 10 Si 7 liquid and K S0 = 112.1(1.5) GPa, K S ’ = 4.0(0.1) and ρ 0 =6.64 g/cm 3 for Si-rich Fe 72 Ni 10 S 5 Si 13 liquid. The V P of Fe–Ni–S–Si liquids locate in between those of Fe–Ni–S and Fe–Ni–Si liquids. This suggests that the effect of multiple light element (S and Si) on the V P is suppressed and cancel out the effects of single light elements (S and Si) on the V P . The effect of composition on the EOS in the Fe–Ni–S–Si system is indispensable to estimate the core composition combined with the geodesy data of upcoming Mercury mission.
Type of Medium:
Online Resource
ISSN:
0342-1791
,
1432-2021
DOI:
10.1007/s00269-023-01243-8
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2023
detail.hit.zdb_id:
1463021-7
detail.hit.zdb_id:
131393-9
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