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Fe2O3_Leading local media on chemical materials, nano-ma
  • TEM images and SAED pattern were obtained using a JEOL JEM–2010 electron microscope operating at 160 kV with a point–to–point resolution of 1.9 Å. For each measurement, a very dilute sample dispersion drop was placed on a copper grid with a holey carbon film and allowed to dry under vacuum at room temperature. HRTEM images were obtained using a TITAN 60–300 high-resolution transmission electron microscope with an X-FEG emission gun operating at 80 kV. For HRTEM analyses, the powder β-Fe2O3 sampl XRD analysis of the initial β-Fe2O3 sample was recorded on a PANalytical X'Pert PRO diffractometer in the Bragg-Brentano geometry, equipped with an iron-filtered CoKα radiation source, an X'Celerator detector, a programmable divergence, and diffracted beam anti-scatter slits. Generally, 200 μL of a sample suspension was dropped onto a zero–background single–crystal Si slide, allowed to dry under vacuum at room temperature, and scanned in continuous mode (resolution of 0.017° in 2θ, scan speed of β-Fe2O3 nanoparticles were synthesized by the thermally-induced solid-state reaction of NaCl with Fe2(SO4)3 in air, followed by post-processing separation based on the dissolution of all by-products in water as described previously. High-pressure X-ray powder diffraction experiments with synchrotron radiation were performed using a diamond anvil cell high-pressure apparatus. A powdered β-Fe2O3 sample was loaded into a 50–100 μm diameter hole that was drilled into a rhenium gasket. Several ruby c The pressure-induced transformation of the rare β-Fe2O3 phase has been studied for the first time, leading to the identification of a new iron(III) oxide polymorph, ζ-Fe2O3. The transformation of β-Fe2O3 into ζ-Fe2O3 occurs above 30 GPa, and the new phase withstands pressures of up to ~70 GPa, which is well above the thresholds for the pressure-induced transformations of α-Fe2O3 or γ-Fe2O3. More strikingly, ζ-Fe2O3 remains stable after pressure release and at room temperature. This remarkable ob The sample's magnetic properties after the pressure release were investigated by measuring the temperature dependence of its mass susceptibility, χ. Its χ profile contains two pronounced maxima at ~69 K (designated TN) and ~269 K (designated TM). Moving away from these temperatures, χ decreases, indicating a transition to an antiferromagnetic state. The profile of the maximum at ~269 K resembles that of the Morin transition of α-Fe2O3, i.e., the transition from a weakly ferromagnetic regime to a After releasing the pressure, RO-Fe2O3 and PPV-Fe2O3 spontaneously reverted to the more thermodynamically stable α-Fe2O3 polymorph. However, strikingly, the ζ-Fe2O3 phase retained its crystal structure after the pressure release. The presence of α-Fe2O3 and ζ-Fe2O3 phase in the sample after the pressure release was further evidenced by analyzing selective area electron diffraction (SAED) pattern where planes belonging to α-Fe2O3 and ζ-Fe2O3 phase were identified (other, not assigned planes most Surprisingly, β-Fe2O3 was found to transform into a completely new crystal structure following the Rietveld refinement of the synchrotron radiation XRD patterns recorded at pressures above 30 GPa. The analyses were carried out adopting the following scenario. At high pressures (42.9–64.4 GPa), α-Fe2O3 transforms into RO-Fe2O3 and PPV-Fe2O3 with consistent transition pressures compared with the previous reports. On the other hand, β-Fe2O3 transits to a different new phase. By indexing these new p The effect of pressure treatment on the crystal structure of β-Fe2O3 was investigated using high-pressure synchrotron radiation XRD measurements. Representative high-pressure synchrotron XRD spectra and the detailed Rietveld analyses of all the measured synchrotron radiation XRD patterns (including the values of the Rwp-factor) are depicted in Supplementary Figures S1–S7 in the Supplementary Material. At up to 10 GPa pressures, the sample consists of β-Fe2O3 and α-Fe2O3 in approximately the same Before its pressure treatment, the purity and structural features of the synthesized β-Fe2O3 sample were checked using conventional X-ray powder diffraction (XRD) and 57Fe Mössbauer spectroscopy. The room-temperature 57Fe Mössbauer spectrum of the β-Fe2O3 sample is well deconvoluted into three spectral components – two dominant doublets whose isomer shift and quadrupole splitting values are characteristic of the b-sites and d-sites in the β-Fe2O3 crystal lattice (with an ideal spectral ratio of Iron(III) oxide shows a polymorphism, characteristic of the existence of phases with the same chemical composition but distinct crystal structures and, hence, physical properties. Four crystalline phases of iron(III) oxide have previously been identified: α-Fe2O3 (hematite), β-Fe2O3, γ-Fe2O3 (maghemite), and ε-Fe2O3. All four iron(III) oxide phases easily undergo various phase transformations in response to heating or pressure treatment, usually forming hexagonal α-Fe2O3, the most thermodynamica

The powder β Fe2O3 sample

TEM images and SAED pattern were obtained using a JEOL JEM–2010 electron microscope operating at 160 kV with a point–to–point resolution of 1.9 Å. For each measurement, a very dilute sample dispersion drop was placed on a copper grid with a holey carbon film and allowed to dry under vacuum at room temperature. HRTEM images were obtained using a TITAN 60–300 high-resolution transmission electron microscope with an X-FEG emission gun operating at 80 kV. For HRTEM analyses, the powder β-Fe2O3 sampl

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XRD analysis of the initial β Fe2O3 sample

XRD analysis of the initial β-Fe2O3 sample was recorded on a PANalytical X'Pert PRO diffractometer in the Bragg-Brentano geometry, equipped with an iron-filtered CoKα radiation source, an X'Celerator detector, a programmable divergence, and diffracted beam anti-scatter slits. Generally, 200 μL of a sample suspension was dropped onto a zero–background single–crystal Si slide, allowed to dry under vacuum at room temperature, and scanned in continuous mode (resolution of 0.017° in 2θ, scan speed of

More>>

Synthesis of b Fe2O3 nanoparticles

β-Fe2O3 nanoparticles were synthesized by the thermally-induced solid-state reaction of NaCl with Fe2(SO4)3 in air, followed by post-processing separation based on the dissolution of all by-products in water as described previously. High-pressure X-ray powder diffraction experiments with synchrotron radiation were performed using a diamond anvil cell high-pressure apparatus. A powdered β-Fe2O3 sample was loaded into a 50–100 μm diameter hole that was drilled into a rhenium gasket. Several ruby c

More>>

The pressure induced transformation of the rare β Fe2O3 phase

The pressure-induced transformation of the rare β-Fe2O3 phase has been studied for the first time, leading to the identification of a new iron(III) oxide polymorph, ζ-Fe2O3. The transformation of β-Fe2O3 into ζ-Fe2O3 occurs above 30 GPa, and the new phase withstands pressures of up to ~70 GPa, which is well above the thresholds for the pressure-induced transformations of α-Fe2O3 or γ-Fe2O3. More strikingly, ζ-Fe2O3 remains stable after pressure release and at room temperature. This remarkable ob

More>>

The Morin transition of α Fe2O3

The sample's magnetic properties after the pressure release were investigated by measuring the temperature dependence of its mass susceptibility, χ. Its χ profile contains two pronounced maxima at ~69 K (designated TN) and ~269 K (designated TM). Moving away from these temperatures, χ decreases, indicating a transition to an antiferromagnetic state. The profile of the maximum at ~269 K resembles that of the Morin transition of α-Fe2O3, i.e., the transition from a weakly ferromagnetic regime to a

More>>

RO Fe2O3 and PPV Fe2O3 spontaneously reverted to the more thermodynamically

After releasing the pressure, RO-Fe2O3 and PPV-Fe2O3 spontaneously reverted to the more thermodynamically stable α-Fe2O3 polymorph. However, strikingly, the ζ-Fe2O3 phase retained its crystal structure after the pressure release. The presence of α-Fe2O3 and ζ-Fe2O3 phase in the sample after the pressure release was further evidenced by analyzing selective area electron diffraction (SAED) pattern where planes belonging to α-Fe2O3 and ζ-Fe2O3 phase were identified (other, not assigned planes most

More>>

βFe2O3 was found to transform into a completely new crystal structure

Surprisingly, β-Fe2O3 was found to transform into a completely new crystal structure following the Rietveld refinement of the synchrotron radiation XRD patterns recorded at pressures above 30 GPa. The analyses were carried out adopting the following scenario. At high pressures (42.9–64.4 GPa), α-Fe2O3 transforms into RO-Fe2O3 and PPV-Fe2O3 with consistent transition pressures compared with the previous reports. On the other hand, β-Fe2O3 transits to a different new phase. By indexing these new p

More>>

The effect of pressure treatment on the crystal structure of β Fe2O3

The effect of pressure treatment on the crystal structure of β-Fe2O3 was investigated using high-pressure synchrotron radiation XRD measurements. Representative high-pressure synchrotron XRD spectra and the detailed Rietveld analyses of all the measured synchrotron radiation XRD patterns (including the values of the Rwp-factor) are depicted in Supplementary Figures S1–S7 in the Supplementary Material. At up to 10 GPa pressures, the sample consists of β-Fe2O3 and α-Fe2O3 in approximately the same

More>>

The synthesized β Fe2O3

Before its pressure treatment, the purity and structural features of the synthesized β-Fe2O3 sample were checked using conventional X-ray powder diffraction (XRD) and 57Fe Mössbauer spectroscopy. The room-temperature 57Fe Mössbauer spectrum of the β-Fe2O3 sample is well deconvoluted into three spectral components – two dominant doublets whose isomer shift and quadrupole splitting values are characteristic of the b-sites and d-sites in the β-Fe2O3 crystal lattice (with an ideal spectral ratio of

More>>

Zeta Fe2O3 A new stable polymorph in iron III oxide family

Iron(III) oxide shows a polymorphism, characteristic of the existence of phases with the same chemical composition but distinct crystal structures and, hence, physical properties. Four crystalline phases of iron(III) oxide have previously been identified: α-Fe2O3 (hematite), β-Fe2O3, γ-Fe2O3 (maghemite), and ε-Fe2O3. All four iron(III) oxide phases easily undergo various phase transformations in response to heating or pressure treatment, usually forming hexagonal α-Fe2O3, the most thermodynamica

More>>

Does iron oxide prevent rust

What is iron oxide?Iron oxides are chemical compounds composed of iron and oxygen. Several iron oxides are recognized. All are black magnetic solids. Often they are non-stoichiometric. Oxyhydroxides are a related class of compounds, perhaps the best known of which is rust. Generally, iron oxides are prevalent and widely used as they are inexpensive and play an imperative role in many biological and geological processes. Humans also extensively use them as iron ores in thermite, catalysts, durabl

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High Purity Iron Oxide Fe2O3 Powder CAS 1309-37-1,99.9%

is a reliable supplier for high purity Iron Oxide Fe2O3 Powder CAS 1309-37-1,99.9% .

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