Spin Transitions and Compressibility of ε-Fe7N3 and γ′-Fe4N: Implications for Iron Alloys in Terrestrial Planet Cores
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作者:
Lv, Mingda
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Michigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USAMichigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
Lv, Mingda
[1
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Liu, Jiachao
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Michigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing, Peoples R ChinaMichigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
Liu, Jiachao
[1
,2
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Zhu, Feng
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Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA
Univ Hawaii Manoa, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USAMichigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
Zhu, Feng
[3
,4
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Li, Jie
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Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USAMichigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
Li, Jie
[3
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Zhang, Dongzhou
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Univ Hawaii Manoa, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA
Univ Chicago, GeoSoiEnviroCARS, Chicago, IL 60637 USAMichigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
Zhang, Dongzhou
[4
,5
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Xiao, Yuming
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Argonne Natl Lab, High Pressure Collaborat Access Team ILPCAT, Xray Sci Div, Argonne, IL 60439 USAMichigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
Xiao, Yuming
[6
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Dorfman, Susannah M.
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Michigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USAMichigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
Dorfman, Susannah M.
[1
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机构:
[1] Michigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
[2] Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Beijing, Peoples R China
[3] Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA
[4] Univ Hawaii Manoa, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA
[5] Univ Chicago, GeoSoiEnviroCARS, Chicago, IL 60637 USA
[6] Argonne Natl Lab, High Pressure Collaborat Access Team ILPCAT, Xray Sci Div, Argonne, IL 60439 USA
Iron nitrides are possible constituents of the cores of Earth and other terrestrial planets. Pressure-induced magnetic changes in iron nitrides and effects on compressibility remain poorly understood. Here we report synchrotron X-ray emission spectroscopy (XES) and X-ray diffraction (XRD) results for epsilon-Fe7N3 and gamma '-Fe4N up to 60 GPa at 300 K. The XES spectra reveal completion of high- to low-spin transition in epsilon-Fe7N3 and gamma '-Fe4N at 43 and 34 GPa, respectively. The completion of the spin transition induces stiffening in bulk modulus of epsilon-Fe7N3 by 22% at similar to 40 GPa, but has no resolvable effect on the compression behavior of gamma '-Fe4N. Fitting pressure-volume data to the Birch-Murnaghan equation of state yields V-0 = 83.29 +/- 0.03 (angstrom(3)), K-0 = 232 +/- 9 GPa, K-0 ' = 4.1 +/- 0.5 for nonmagnetic epsilon-Fe7N3 above the spin transition completion pressure, and V-0 = 54.82 +/- 0.02 (angstrom(3)), K-0 = 152 +/- 2 GPa, K-0 ' = 4.0 +/- 0.1 for gamma '-Fe4N over the studied pressure range. By reexamining evidence for spin transition and effects on compressibility of other candidate components of terrestrial planet cores, Fe3S, Fe3P, Fe7C3, and Fe3C based on previous XES and XRD measurements, we located the completion of high- to low-spin transition at similar to 67, 38, 50, and 30 GPa at 300 K, respectively. The completion of spin transitions of Fe3S, Fe3P, and Fe3C induces elastic stiffening, whereas that of Fe7C3 induces elastic softening. Changes in compressibility at completion of spin transitions in iron-light element alloys may influence the properties of Earth's and planetary cores.
机构:
Univ Tokyo, Dept Earth & Planetary Sci, Tokyo, Japan
Tokyo Inst Technol, Earth Life Sci Inst, Tokyo, JapanUniv Tokyo, Dept Earth & Planetary Sci, Tokyo, Japan
Kusakabe, Mayu
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Hirose, Kei
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Sinmyo, Ryosuke
Kuwayama, Yasuhiro
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Univ Tokyo, Dept Earth & Planetary Sci, Tokyo, JapanUniv Tokyo, Dept Earth & Planetary Sci, Tokyo, Japan
Kuwayama, Yasuhiro
Ohishi, Yasuo
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Japan Synchrotron Radiat Res Inst, Sayo, JapanUniv Tokyo, Dept Earth & Planetary Sci, Tokyo, Japan
机构:
Korea Inst Ind Technol KITECH, Dongnam Reg Div, Jungang Ro 33-1, Yangsan 50623, South KoreaKorea Inst Ind Technol KITECH, Dongnam Reg Div, Jungang Ro 33-1, Yangsan 50623, South Korea
Kim, Sunkwang
Yoon, Sungook
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Korea Shipbldg & Offshore Engn Co Ltd, Bangeojinsunhwando Ro 1000, Ulsan 44032, South KoreaKorea Inst Ind Technol KITECH, Dongnam Reg Div, Jungang Ro 33-1, Yangsan 50623, South Korea
Yoon, Sungook
Kim, Jun-Ho
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Korea Inst Ind Technol KITECH, Dongnam Reg Div, Jungang Ro 33-1, Yangsan 50623, South KoreaKorea Inst Ind Technol KITECH, Dongnam Reg Div, Jungang Ro 33-1, Yangsan 50623, South Korea
Kim, Jun-Ho
Park, Soon
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Univ Ulsan, Sch Mat Sci & Engn, Techno Saneop Ro 55 Beon Gil 12, Ulsan 44776, South KoreaKorea Inst Ind Technol KITECH, Dongnam Reg Div, Jungang Ro 33-1, Yangsan 50623, South Korea