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Sound velocities of iron-nickel (Fe90Ni10) alloy up to 8 GPa and 773 K: The effect of nickel on the elastic properties of bcc-iron at high P-T

Journal Article · · American Mineralogist
DOI:https://doi.org/10.2138/am-2021-7716· OSTI ID:1981038
 [1];  [2];  [3];  [4];  [5]
  1. Department of Geosciences, Stony Brook University, Stony Brook, New York 11794, U.S.A.; OSTI
  2. Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794, U.S.A.; † Present addresses: College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China.
  3. Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794, U.S.A.
  4. Department of Geosciences, Stony Brook University, Stony Brook, New York 11794, U.S.A.
  5. Department of Geosciences, Stony Brook University, Stony Brook, New York 11794, U.S.A.; Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794, U.S.A.
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Abstract

Sound velocities of iron and iron-based alloys at high pressure and high temperature are crucial for understanding the composition and structure of Earth’s and other telluric planetary cores. In this study, we performed ultrasonic interferometric measurements of both compressional (νP) and shear (νS) velocities on a polycrystalline body-centered-cubic (bcc)-Fe90Ni10 up to 8 GPa and 773 K. The elastic moduli and their pressure and temperature derivatives are derived from least-square fits to third-order finite strain equations, yielding KS0 = 154.2(8) GPa, G0 = 73.2(2) GPa, KS0' = 4.6(2), G0' = 1.5(1), ∂KS/∂T = –0.028(1) GPa/K, and ∂G/∂T = –0.023(1) GPa/K. A comparison with literature data on bcc-Fe suggests that nickel not only decreases both P and S wave velocities but also weakens the temperature effects on the elastic moduli of Fe-Ni alloys.

Research Organization:
State Univ. of New York (SUNY), Albany, NY (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
DOE Contract Number:
NA0003886
OSTI ID:
1981038
Journal Information:
American Mineralogist, Journal Name: American Mineralogist Journal Issue: 11 Vol. 106; ISSN 0003-004X
Publisher:
Mineralogical Society of America
Country of Publication:
United States
Language:
English

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