TY - JOUR
T1 - Structural characterization of temperature- and pressure-induced inverse normal spinel transformation in magnetite
AU - Rozenberg, G. Kh
AU - Amiel, Y.
AU - Xu, W. M.
AU - Pasternak, M. P.
AU - Jeanloz, R.
AU - Hanfland, M.
AU - Taylor, R. D.
PY - 2007
Y1 - 2007
N2 - High-precision powder x-ray diffraction and Fe57 Mössbauer studies up to 20 GPa show that magnetite (Fe3 O4) undergoes a reversible normal inverse transition with increasing pressure or decreasing temperature. There is no resolvable change in the spinel-type crystal structure or unit-cell volume at the phase transition. However, the volume of the tetrahedral (A) site increases (17%) and that of the octahedral (B) site decreases (∼7%) as electron charge density is transferred from the B to the A site. The corresponding valence changes cause the inverse → normal transition with increasing pressure: FeA 3+ → FeA 2+ and FeB 2.5+ → FeB 3+. There is an intermediate mixed configuration region at pressure-temperature (P-T) conditions lying between those at which magnetite is normal, T< Tnorm (P), or inverse, T> Tinv (P).
AB - High-precision powder x-ray diffraction and Fe57 Mössbauer studies up to 20 GPa show that magnetite (Fe3 O4) undergoes a reversible normal inverse transition with increasing pressure or decreasing temperature. There is no resolvable change in the spinel-type crystal structure or unit-cell volume at the phase transition. However, the volume of the tetrahedral (A) site increases (17%) and that of the octahedral (B) site decreases (∼7%) as electron charge density is transferred from the B to the A site. The corresponding valence changes cause the inverse → normal transition with increasing pressure: FeA 3+ → FeA 2+ and FeB 2.5+ → FeB 3+. There is an intermediate mixed configuration region at pressure-temperature (P-T) conditions lying between those at which magnetite is normal, T< Tnorm (P), or inverse, T> Tinv (P).
UR - http://www.scopus.com/inward/record.url?scp=33846306689&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.75.020102
DO - 10.1103/PhysRevB.75.020102
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AN - SCOPUS:33846306689
SN - 1098-0121
VL - 75
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 2
M1 - 020102
ER -