Abstract
The crystal structure of Fe-10%Ni was investigated up to 340GPa and 4700K, corresponding to the Earth's inner core conditions by synchrotron X-ray diffraction measurements in-situ at ultrahigh pressure and temperature in a laser-heated diamond-anvil cell. The results show that hexagonal closed-packed (hcp) structure is stable throughout the experimental conditions investigated with no evidence for a phase transition to body-centered cubic (bcc) or face-centered cubic (fcc) phases. The axial c/a ratio of the hcp crystal obtained around 330GPa has a small temperature dependence similar to the axial ratio of pure Fe. Iron alloy with less than 10% Ni crystallizes to an hcp structure with c/a ratio of ∼1.61 at inner core conditions, although the effect of small amount of light elements remains to be examined by experiments.
| Original language | English |
|---|---|
| Article number | L12305 |
| Journal | Geophysical Research Letters |
| Volume | 39 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Jun 28 2012 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
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The structure of Fe-Ni alloy in Earth's inner core. / Tateno, Shigehiko; Hirose, Kei; Komabayashi, Tetsuya; Ozawa, Haruka; Ohishi, Yasuo.
In: Geophysical Research Letters, Vol. 39, No. 12, L12305, 28.06.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The structure of Fe-Ni alloy in Earth's inner core
AU - Tateno, Shigehiko
AU - Hirose, Kei
AU - Komabayashi, Tetsuya
AU - Ozawa, Haruka
AU - Ohishi, Yasuo
PY - 2012/6/28
Y1 - 2012/6/28
N2 - The crystal structure of Fe-10%Ni was investigated up to 340GPa and 4700K, corresponding to the Earth's inner core conditions by synchrotron X-ray diffraction measurements in-situ at ultrahigh pressure and temperature in a laser-heated diamond-anvil cell. The results show that hexagonal closed-packed (hcp) structure is stable throughout the experimental conditions investigated with no evidence for a phase transition to body-centered cubic (bcc) or face-centered cubic (fcc) phases. The axial c/a ratio of the hcp crystal obtained around 330GPa has a small temperature dependence similar to the axial ratio of pure Fe. Iron alloy with less than 10% Ni crystallizes to an hcp structure with c/a ratio of ∼1.61 at inner core conditions, although the effect of small amount of light elements remains to be examined by experiments.
AB - The crystal structure of Fe-10%Ni was investigated up to 340GPa and 4700K, corresponding to the Earth's inner core conditions by synchrotron X-ray diffraction measurements in-situ at ultrahigh pressure and temperature in a laser-heated diamond-anvil cell. The results show that hexagonal closed-packed (hcp) structure is stable throughout the experimental conditions investigated with no evidence for a phase transition to body-centered cubic (bcc) or face-centered cubic (fcc) phases. The axial c/a ratio of the hcp crystal obtained around 330GPa has a small temperature dependence similar to the axial ratio of pure Fe. Iron alloy with less than 10% Ni crystallizes to an hcp structure with c/a ratio of ∼1.61 at inner core conditions, although the effect of small amount of light elements remains to be examined by experiments.
UR - http://www.scopus.com/inward/record.url?scp=84862885702&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84862885702&partnerID=8YFLogxK
U2 - 10.1029/2012GL052103
DO - 10.1029/2012GL052103
M3 - Article
AN - SCOPUS:84862885702
VL - 39
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 12
M1 - L12305
ER -