Mössbauer and resistivity studies of the magnetic and electronic properties of the high-pressure phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Xu, Weiming; Machavariani, G.Yu.; Rozenberg, G. Kh.; Pasternak, M.

doi:10.1103/physrevb.70.174106

Cited by 31 publications

(36 citation statements)

References 16 publications

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“…13 and agrees with the high-pressure structural and magnetic modification of magnetite. 7,9 Upon pressure release, the XMCD signal recovers to its corresponding value at ambient pressure (Fig. 4) Figures 5, 6, and 7, respectively.…”

Section: Resultsmentioning

confidence: 81%

“…Particularly, magnetite is, at ambient conditions, a ferrimagnetic cubic inverse spinel where the tetrahedral A and octahedral B sites are occupied by nominally Fe 3+ and mixedvalent Fe 2.5+ configurations, respectively. 3 Its high-pressure behavior has been extensively studied by x-ray diffraction (XRD), [4][5][6][7] Mössbauer spectroscopy, 8,9 and electrical resistivity measurements. 9,10 Above 25 GPa, magnetite undergoes a sluggish structural transformation to a high-pressure phase [4][5][6][7] as reflections of the low-pressure spinel phase could be traced up to at least 60 GPa.…”

Section: Introductionmentioning

confidence: 99%

“…This high-pressure structure does not order magnetically at 300 K 7 and shows a semiconductorlike behavior. 9,10 Fe K-edge x-ray magnetic circular dichroism (XMCD) measurements [11][12][13] have been reported to give a comprehensive view of the magnetic behavior of magnetite with pressure. A pressure-induced magnetic transition shown by a sharp decrease (∼50%) in the amplitude of the XMCD signal was reported between 12 and 16 GPa by Ding et al (Ref.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of pressure-induced magnetic transitions in CoxFe3−xO4
Subı́as
¹
,
Cuartero
²
,
Garcı́a
³

et al. 2013
Phys. Rev. B
30
4
16
0
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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of pressure-induced magnetic transitions in CoxFe3−xO4
Subı́as
¹
,
Cuartero
²
,
Garcı́a
³

et al. 2013
Phys. Rev. B
30
4
16
0
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“…Although the high-pressure polymorph of magnetite is known to be a semiconductor (26,27), a detailed account of the electronic structure of Fe 4 O 5 is beyond the scope of this study and will be the subject of a forthcoming investigation along with experimental efforts. As in the isostructural calcium ferrite (28), electron delocalization is expected among the edge-sharing iron sites with short Fe-Fe distances (Fig.…”

Section: Energetics and Stability Ofmentioning

confidence: 99%

Discovery of the recoverable high-pressure iron oxide Fe₄O₅

Lavina

Dera

Kim

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

130

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Phases of the iron–oxygen binary system are significant to most scientific disciplines, directly affecting planetary evolution, life, and technology. Iron oxides have unique electronic properties and strongly interact with the environment, particularly through redox reactions. The iron–oxygen phase diagram therefore has been among the most thoroughly investigated, yet it still holds striking findings. Here, we report the discovery of an iron oxide with formula Fe 4 O 5 , synthesized at high pressure and temperature. The previously undescribed phase, stable from 5 to at least 30 GPa, is recoverable to ambient conditions. First-principles calculations confirm that the iron oxide here described is energetically more stable than FeO + Fe 3 O 4 at pressure greater than 10 GPa. The calculated lattice constants, equation of states, and atomic coordinates are in excellent agreement with experimental data, confirming the synthesis of Fe 4 O 5 . Given the conditions of stability and its composition, Fe 4 O 5 is a plausible accessory mineral of the Earth’s upper mantle. The phase has strong ferrimagnetic character comparable to magnetite. The ability to synthesize the material at accessible conditions and recover it at ambient conditions, along with its physical properties, suggests a potential interest in Fe 4 O 5 for technological applications.

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“…Previous studies of an archetypal spinel and the oldest recognized natural magnetic material, magnetite (Fe 2+ Fe 3+ 2 O 4 ), utilizing 57 Fe Mössbauer spectroscopy (MS), also revealed a pressure-induced first-order phase transition at the pressure range 25-45 GPa [11], in good agreement with XRD studies [12][13][14]. However, according to MS measurements [11], the postspinel phase exhibits, in addition to the Fe 2+ site, two distinct Fe 3+ sites with different hyperfine interaction parameters. These MS results appear inconsistent with the abovementioned XRD studies claiming that the postspinel Fe 3 O 4 phase is of the CaMn 2 O 4 or CaTi 2 O 4 type structures, wherein all Fe 3+ cations should occupy equivalent crystallographic sites.…”

Section: Introductionmentioning

confidence: 99%

High-pressure magnetic, electronic, and structural properties ofMFe2O4(M=Mg,
Greenberg
¹
,
Xu
²
,
Nikolaevsky
³

et al. 2017
Phys. Rev. B
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0
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Magnetic, electronic, and structural properties of MFe 2 O 4 (M = Mg,Zn,Fe) ferric spinels have been studied by 57 Fe Mössbauer spectroscopy, electrical conductivity, and powder and single-crystal x-ray diffraction (XRD) to a pressure of 120 GPa and in the 2.4-300 K temperature range. These studies reveal for all materials, at the pressure range 25-40 GPa, an irreversible first-order structural transition to the postspinel CaTi 2 O 4 − type structure (Bbmm) in which the HS Fe 3+ occupies two different crystallographic sites characterized by six-and eightfold coordination polyhedra, respectively. Above 40 GPa, an onset of a sluggish second-order high-to-low spin (HS-LS) transition is observed on the octahedral Fe 3+ sites while Fe 3+ occupying bicapped trigonal prism sites remain in the HS state. Despite an appreciable resistance decrease, corroborating with the transition to the LS state, MgFe 2 O 4 and ZnFe 2 O 4 remain semiconductors at this pressure range. However, in the case of Fe 3 O 4 , the second-order HS-LS transition on the Fe 3+ octahedral sites corroborates with a clear trend to a gap closure and formation of a semimetal state above 50 GPa. Above 65 GPa, another structural phase transition is observed in Fe 3 O 4 to a new Pmma structure. This transition coincides with the onset of nonmagnetic Fe 2+ , signifying further propagation of the gradual collapse of magnetism corroborating with a sluggish metallization process. With this, half of Fe 3+ sites remain in the HS state. Thus, this paper demonstrates that, in a material with a complex crystal structure containing transition metal cation(s) in different environments, a HS-LS transition and delocalization/metallization of the 3d electrons does not necessarily occur simultaneously and may propagate through different crystallographic sites at different degrees of compression.

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Mössbauer and resistivity studies of the magnetic and electronic properties of the high-pressure phase ofFe3O4

Cited by 31 publications

References 16 publications

Investigation of pressure-induced magnetic transitions in CoxFe3−xO4
Subı́as
¹
,
Cuartero
²
,
Garcı́a
³

et al. 2013
Phys. Rev. B
30
4
16
0
View full text Add to dashboard Cite

Investigation of pressure-induced magnetic transitions in CoxFe3−xO4
Subı́as
¹
,
Cuartero
²
,
Garcı́a
³

et al. 2013
Phys. Rev. B
30
4
16
0
View full text Add to dashboard Cite

Discovery of the recoverable high-pressure iron oxide Fe₄O₅

High-pressure magnetic, electronic, and structural properties ofMFe2O4(M=Mg,
Greenberg
¹
,
Xu
²
,
Nikolaevsky
³

et al. 2017
Phys. Rev. B
Self Cite
28
2
21
0
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Mössbauer and resistivity studies of the magnetic and electronic properties of the high-pressure phase ofFe3O4

Cited by 31 publications

References 16 publications

Investigation of pressure-induced magnetic transitions in CoxFe3−xO4Subı́as1, Cuartero2, Garcı́a3 et al. 2013Phys. Rev. B304160View full textAdd to dashboardCite

Investigation of pressure-induced magnetic transitions in CoxFe3−xO4Subı́as1, Cuartero2, Garcı́a3 et al. 2013Phys. Rev. B304160View full textAdd to dashboardCite

Discovery of the recoverable high-pressure iron oxide Fe4O5

High-pressure magnetic, electronic, and structural properties ofMFe2O4(M=Mg,Greenberg1, Xu2, Nikolaevsky3 et al. 2017Phys. Rev. BSelf Cite282210View full textAdd to dashboardCite

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Investigation of pressure-induced magnetic transitions in CoxFe3−xO4
Subı́as
¹
,
Cuartero
²
,
Garcı́a
³

et al. 2013
Phys. Rev. B
30
4
16
0
View full text Add to dashboard Cite

Investigation of pressure-induced magnetic transitions in CoxFe3−xO4
Subı́as
¹
,
Cuartero
²
,
Garcı́a
³

et al. 2013
Phys. Rev. B
30
4
16
0
View full text Add to dashboard Cite

Discovery of the recoverable high-pressure iron oxide Fe₄O₅

High-pressure magnetic, electronic, and structural properties ofMFe2O4(M=Mg,
Greenberg
¹
,
Xu
²
,
Nikolaevsky
³

et al. 2017
Phys. Rev. B
Self Cite
28
2
21
0
View full text Add to dashboard Cite