TY - JOUR
T1 - Isothermal compression of face-centered cubic iron
AU - Nishihara, Yu
AU - Nakajima, Yoichi
AU - Akashi, Akihiko
AU - Tsujino, Noriyoshi
AU - Takahashi, Eiichi
AU - Funakoshi, Ken Ichi
AU - Higo, Yuji
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/8
Y1 - 2012/8
N2 - Isothermal compression curves of face-centered cubic iron (γ-Fe) were determined at high temperatures (1273 and 1073 K) up to 27 GPa by in situ X-ray diffraction experiments using synchrotron radiation and the Kawai-type multi-anvil apparatus. Fits of the third-order Birch-Murnaghan equation of state to pressure-volume data yielded V0 = 48.997 ± 0.040 A 3, K T0 = 108.3 ± 2.4 GPa, and K T? = 5.8 ± 0.2 for 1273 K, and V0 = 48.600 ± 0.098 A 3, K T0 = 88.9 ± 5.1 GPa, and KT? = 8.9 ± 0.7 for 1073 K, where V 0, K T0, and K T? are unit-cell volume, bulk modulus and its pressure derivative, respectively, at ambient pressure. The relatively large values of K T? are attributable to successive electronic spin state transitions from mixed-spin at lower pressures to low-spin at higher pressures. When discussing the constituents of Earth's (or other planets') solid inner core in terms of density and equations of state, one must carefully consider the influence of the electronic spin state.
AB - Isothermal compression curves of face-centered cubic iron (γ-Fe) were determined at high temperatures (1273 and 1073 K) up to 27 GPa by in situ X-ray diffraction experiments using synchrotron radiation and the Kawai-type multi-anvil apparatus. Fits of the third-order Birch-Murnaghan equation of state to pressure-volume data yielded V0 = 48.997 ± 0.040 A 3, K T0 = 108.3 ± 2.4 GPa, and K T? = 5.8 ± 0.2 for 1273 K, and V0 = 48.600 ± 0.098 A 3, K T0 = 88.9 ± 5.1 GPa, and KT? = 8.9 ± 0.7 for 1073 K, where V 0, K T0, and K T? are unit-cell volume, bulk modulus and its pressure derivative, respectively, at ambient pressure. The relatively large values of K T? are attributable to successive electronic spin state transitions from mixed-spin at lower pressures to low-spin at higher pressures. When discussing the constituents of Earth's (or other planets') solid inner core in terms of density and equations of state, one must carefully consider the influence of the electronic spin state.
KW - Compression curve
KW - Face-centered cubic (fcc) iron
KW - High pressure
KW - Inner core
KW - Spin transition
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U2 - 10.2138/am.2012.3958
DO - 10.2138/am.2012.3958
M3 - Article
AN - SCOPUS:84866688971
VL - 97
SP - 1417
EP - 1420
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 8-9
ER -