Structural characterization of temperature- and pressure-induced inverse⇆normal spinel transformation in magnetite

被引:79
作者
Rozenberg, G. Kh. [1 ]
Amiel, Y.
Xu, W. M.
Pasternak, M. P.
Jeanloz, R.
Hanfland, M.
Taylor, R. D.
机构
[1] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel
[2] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA
[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
来源
PHYSICAL REVIEW B | 2007年 / 75卷 / 02期
关键词
D O I
10.1103/PhysRevB.75.020102
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
High-precision powder x-ray diffraction and Fe-57 Mossbauer studies up to 20 GPa show that magnetite (Fe3O4) 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 (similar to 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: Fe-A(3+)-> Fe-A(2+) and Fe-B(2.5+)-> Fe-B(3+). There is an intermediate mixed configuration region at pressure-temperature (P-T) conditions lying between those at which magnetite is normal, T < T-norm(P), or inverse, T>T-inv(P).
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页数:4
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