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high pressure magnetite

High‐pressure study of stability of magnetite by

2004-5-1  The calculations predict that the high‐pressure phase of magnetite (h‐Fe 3 O 4) becomes unstable with respect to h‐Fe 2 O 3 + FeO at pressures higher than 50 GPa. The 298 K pressure‐volume isotherm of magnetite

High-pressure phase of magnetite. Semantic Scholar

High-pressure phase of magnetite. @article{Pasternak1994HighpressurePO, title={High-pressure phase of magnetite.}, author={Pasternak and Nasu and Wada and Endo}, journal={Physical review. B, Condensed matter}, year={1994}, volume={50 9}, pages={ 6446-6449 } } Pasternak, Nasu, +1 author Endo; Published 1994

Metallization of magnetite at high pressures

2002-3-1  Here we report on the recent results that a metallic ground state in magnetite is realized at pressures above 6–8 GPa, though the metallic phase was not expected to occur at such a

High-pressure elasticity of a natural magnetite crystal

2004-7-1  The bulk modulus and its pressure derivative obtained dynamically are consistent with the isothermal equation of state, measured on the same sample by single-crystal X-ray diffraction, yielding K 0T = 180.0(1.0) and K T ′ = 5.2(4). Pressure-induced shear-mode softening in magnetite is most likely related to magnetoelastic coupling and the first-order phase transition to an orthorhombic structure

Unraveling the exhumation history of high-pressure

2020-8-1  Magnetite is a ubiquitous oxide in ultramafic and mafic rocks, which is present in a large range of geological and tectonic settings. In the case of high-pressure ultramafic rocks, exhumation timing is commonly constrained by geochronometers in nearby lithologies.

Phys. Rev. B 50, 6446 (1994) High-pressure phase of

1994-9-1  The high-pressure phase is not magnetic at 300 K and its monoclinic structural features resemble that of the low-pressure phase. The tetrahedral and octahedral sites characteristic of the inverse spinel structure, albeit distorted, remain the building blocks of the high-pressure phase.

Abnormal Elastic and Vibrational Behaviors of

2014-9-4  High-pressure HERIX spectra of the single-crystal magnetite platelet with the pre-oriented (100) crystallographic plane were measured up to 19 GPa in

Spin state of iron in Fe${}_{3}$O${}_{4}$ magnetite and

2013-4-22  The high-pressure behavior of magnetite has been widely debated in the literature. Experimental measurements have found conflicting high-pressure transitions: a charge reordering in magnetite from inverse-spinel to normal-spinel [Pasternak et al., J. Phys. Chem. Solids 65, 1531 (2004); Rozenberg et al., Phys. Rev. B 75, 020102 (2007) ], iron

Magnetic and electronic properties of magnetite

2019-3-14  An application of high pressure affects anomalously the behavior of magnetic and electronic properties of magnetite, ultimately leading to a structural phase

Novel Pressure-Induced Magnetic Transition in Magnetite

2008-2-4  Magnetite (Fe3O4), the oldest known magnet, has aninverse spinel structure with the formula ofFe3Fe2 Fe3OhO4. The magnetic moments on tet-Tdrahedral (Td) and octahedral (Oh) sites couple antiferro-magnetically resulting in a ferrimagnet with a netsaturation magnetic moment of4Bper formula unit, asconfirmed by experimental measurement of4:07B.Recently, a set of high-pressure electrical, Mo¨ssbauer, andx-ray diffraction measurements conducted on magnetite,partly directed at decoding the origin of the Verwey tran-sition (VT) [2,3], disclosed a complex behavior of pres-sure- and temperature-dependent behaviors. In addition toreports that the temperature-induced VT vanishes at highpressure

Equation of state of magnetite and its high-pressure

2000-3-1  Fe 3 O 4 has been studied by high-pressure diffraction to 43 GPa. No major changes in the spinel-type structure of magnetite is observed below 21.8 GPa. At higher pressure a sluggish transition to a high-pressure modification, h-Fe 3 O 4, is observed.The X-ray diffraction pattern of the high-pressure modification is consistent with the orthorhombic unit cell (CaMn 2 O 4-type structure, space

Effect of high pressure on the crystal structure and

2014-6-11  of magnetite below 25 GPa, two possible scenarios have been heavily discussed in the literature to explain the high-pressure behavior of magnetite. The first hypothesis is a transition from the inverse type (IT) of spinel to the normal type (NT) at pressures 10–20 GPa (Rozenberg et al. 2007; Pasternak et al. 2003). Analysis of pow -

Metallization of magnetite (Fe3O4) under high

2001-6-7  Electrical resistivity measurements have been made on a good qualified single crystalline magnetite (Fe 3 O 4) at temperatures from 300 down to 3.0 K under pressure up to 10 GPa. A steep change in resistivity at the Verwey transition temperature has been observed at pressure below 6.5 GPa, which shows a quite distinct result reported in prior work. Moreover, the Verwey transition temperature

Solubility Study of Magnetite under Extreme High

2014-5-5  A novel flow-through apparatus has been developed to perform a scale solubility, dissolution, and precipitation study of minerals under high pressure (up to 24, 000 psig), high temperature (up to 250 °C), and high total dissolved solids (TDS, up to 360, 000 mg/L). This part of research will focus on the solubility study of magnetite and siderite.

High-pressure Raman spectroscopic study of

We report in situ Raman spectroscopic studies of magnetite in a diamond-anvil cell under hydrostatic conditions up to 60 GPa at room temperature. Magnetite with ideal chemical formula Fe3O4 crystallizes in the face-centered cubic spinel-type structure. There are five first-order Raman active modes (A1g + Eg + 3F2g) in the Fd3m space group of the spinel structure.

Cementite Formation from Magnetite under High

Cementite Formation from Magnetite under High Pressure Conditions Dong-Yuk KIM, Yoon-Uk HEO and Yasushi SASAKI* Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang, 790-784 Korea (South). (Received on November 26, 2012; accepted on March 15, 2013) Measurements have been made of the

Iron spin transitions in high-pressure magnetite

Iron spin transitions in high-pressure magnetite. The spin state of iron (Fe) in materials deep within Earth’s mantle (primarily ferropericlase (Mg,Fe)O and (Mg,Fe) (Si,Fe,Al)O3 perovskite) has been of recent interest. The Fe high- to low-spin transition in ferropericlase is now well supported by both experiment and theory.

Abnormal elastic and vibrational behaviors of

2014-9-4  On the other hand, high-pressure studies at room temperature have also suggested a number of electronic, magnetic, and structural transitions in magnetite including the inverse-normal spinel transition 9,14,15, the high-spin to intermediate-spin transition 16,19, the enhanced delocalization or charge ordering of the 3d electrons of the iron

High pressure in-situ X-ray diffraction study on Zn-doped

2020-6-6  T D ACCEPTED MANUSCRIPT 1 High pressure in-situ X-ray diffraction study on Zn-doped magnetite nanoparticles S. Ferrari 1, V. Bilovol 1, L. G. Pampillo 1, F. Grinblat 1, D. Errandonea 2 1 Universidad de Buenos Aires, Consejo Nacional de lnvestigaciones Científicas y Técnicas, Instituto de Tecnología y Ciencias de la Ingeniería “Ing.

Novel Pressure-Induced Magnetic Transition in Magnetite

2008-2-4  Novel Pressure-Induced Magnetic Transition in Magnetite (Fe 3O 4) Yang Ding,1,* Daniel Haskel,2 Sergei G. Ovchinnikov,3,4 Yuan-Chieh Tseng,2 Yuri S. Orlov,4 Jonathan C. Lang,2 and Ho-kwang Mao1,5,6 1HPSynC, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, Illinois 60439, USA 2Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439,

Effect of high pressure on the crystal structure and

2014-6-11  of magnetite below 25 GPa, two possible scenarios have been heavily discussed in the literature to explain the high-pressure behavior of magnetite. The first hypothesis is a transition from the inverse type (IT) of spinel to the normal type (NT) at pressures 10–20 GPa (Rozenberg et al. 2007; Pasternak et al. 2003). Analysis of pow -

High-Pressure, High-Temperature Study of Magnetite

High-Pressure, High-Temperature Study of Magnetite using Synchrotron Radiation p.577. High-Pressure Studies of Crystals of C 60 /C 70 p.583. Magnetic and Atomic Ordering in K-Phase Powder p.591. Powder Diffraction as a Routine Tool for Ab-Initio Structure Determinations of Metal Hydrides

Revision 2 2 Synthesis of quenchable high-pressure form

2015-10-6  79 high pressure phase. Dubrovinsky et al. (2003) and Lazor et al. (2007) propose P > 19 GPa as 80 pressure for the transition of magnetite to h-magnetite at room temperature. In a Mössbauer 81 and X-ray diffraction study Rozenberg et al. (2007) reported a pressure-induced

Metallization of magnetite (Fe3O4) under high

2001-6-7  Electrical resistivity measurements have been made on a good qualified single crystalline magnetite (Fe 3 O 4) at temperatures from 300 down to 3.0 K under pressure up to 10 GPa. A steep change in resistivity at the Verwey transition temperature has been observed at pressure below 6.5 GPa, which shows a quite distinct result reported in prior work. Moreover, the Verwey transition temperature

Solubility Study of Magnetite under Extreme High

2014-5-5  A novel flow-through apparatus has been developed to perform a scale solubility, dissolution, and precipitation study of minerals under high pressure (up to 24, 000 psig), high temperature (up to 250 °C), and high total dissolved solids (TDS, up to 360, 000 mg/L). This part of research will focus on the solubility study of magnetite and siderite.

Iron spin transitions in high-pressure magnetite

Iron spin transitions in high-pressure magnetite. The spin state of iron (Fe) in materials deep within Earth’s mantle (primarily ferropericlase (Mg,Fe)O and (Mg,Fe) (Si,Fe,Al)O3 perovskite) has been of recent interest. The Fe high- to low-spin transition in ferropericlase is now well supported by both experiment and theory.

Cementite Formation from Magnetite under High

Cementite Formation from Magnetite under High Pressure Conditions Dong-Yuk KIM, Yoon-Uk HEO and Yasushi SASAKI* Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang, 790-784 Korea (South). (Received on November 26, 2012; accepted on March 15, 2013) Measurements have been made of the

Abnormal elastic and vibrational behaviors of

2014-9-4  On the other hand, high-pressure studies at room temperature have also suggested a number of electronic, magnetic, and structural transitions in magnetite including the inverse-normal spinel transition 9,14,15, the high-spin to intermediate-spin transition 16,19, the enhanced delocalization or charge ordering of the 3d electrons of the iron

High pressure in-situ X-ray diffraction study on Zn-doped

2020-6-6  T D ACCEPTED MANUSCRIPT 1 High pressure in-situ X-ray diffraction study on Zn-doped magnetite nanoparticles S. Ferrari 1, V. Bilovol 1, L. G. Pampillo 1, F. Grinblat 1, D. Errandonea 2 1 Universidad de Buenos Aires, Consejo Nacional de lnvestigaciones Científicas y Técnicas, Instituto de Tecnología y Ciencias de la Ingeniería “Ing.

Experimental determination of the reaction 2magnetite

2007-8-30  2almandine + 02 at high pressure on the magnetite-hematite buffer DlNrnr, E. Hlnr,ov Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, U.S.A. Roennr C. NrcwroN Department of the Geophysical Sciences, The University of Chicago, 5734 South Ellis Avenue, Chicago, Illinois 60637, U.S.A. Ansrucr