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14 results for “Fe2O3”
Dataset of "Photoelectrochemical generation of H2O2 using hematite (α-Fe2O3) and gas diffusion electrode (GDE)"
<p>In contrast to the industrial-scale production of H2O2 the electrochemical or photoelectrochemical synthesis is environmentally friendly. In the present work, <br>the photoelectrochemical generation of H2O2 was studied by combining the hematite (α-Fe2O3/FTO/glass) photoanode and gas diffusion electrode (GDE) modified by <br>incorporation of tin (II) phthalocyanine (SnPc) in its hydrophilic layer. The experiments were carried out in a photoelectrochemical cell with two compartments <br>separated by a proton exchange membrane under applied bias and AM1.5 irradiation (100 mW/cm2). The generated amount of H2O2 was determined by chemical analysis <br>(visible light spectrophotometry) of the electrolyte. As a tool to determine the efficiency of such a process, the Faradaic efficiency (FE) was calculated. The <br>best configuration used air as an inlet gas for GDE and phosphate buffer (pH 6.4) as an electrolyte in the cathodic compartment. The combination of hematite and <br>GDE (with SnPc) was the most effective in H2O2 photoelectrochemical generation. The highest value of FE was 52.4 % for GDE (O2 reduction to H2O2) and 0.4 % for <br>hematite photoanode (H2O oxidation to H2O2).</p>
Magnetic hyperthermia with e-Fe2O3 nanoparticles
<p>These data correspond to the figures in the paper: Gu Y. et al. RSC Adv., 2020, 10, 28786–28797. doi:10.1039/d0ra04361c.</p>
Supplementary Material Containing DFT Structure Files and Convergence Tests for our μSR study on Fe2O3
<p>Supplemental material for <em>Local Electronic Structure and Dynamics of Muon-Polaron Complexes in Fe<sub>2</sub>O<sub>3</sub></em></p> <p>M. H. Dehn,<sup>1,2,3</sup> J. K. Shenton,<sup>4,*</sup> D. J. Arseneau,<sup>3</sup> W. A. MacFarlane,<sup>2,3,5</sup> G. D. Morris,<sup>3</sup> A. Maigné,<sup>2</sup> N. A. Spaldin<sup>4</sup> and R. F. Kiefl<sup>1,2,3</sup></p> <p><sup>1</sup>Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada<br> <sup>2</sup>Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada<br> <sup>3</sup>Triumf, Vancouver, BC V6T 2A3, Canada<br> <sup>4</sup>Department of Materials, ETH Zurich, CH-8093 Zürich, Switzerland<br> <sup>5</sup>Department of Chemistry, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada<br> <sup>*</sup> For queries about the supplemental material in this repository contact <a href="mailto:john.shenton@mat.ethz.ch">J. Kane Shenton</a>.</p> <p>In these notebooks we provide supplemental material for our work on understanding the behaviour of muon-polaron complexes in Fe<sub>2</sub>O<sub>3</sub>.</p> <p>We provide VASP input and output files for each of the candidate muon stopping sites and states identified in the paper (also labelled as in the paper). We summarise the muon stopping sites and provide the code for analysing hyperfine tensors in the jupyter notebook: <a href="https://nbviewer.jupyter.org/github/Shenton-supplemental/Muons_in_Fe2O3/blob/master/Muon-site-summary.ipynb"><code>Muon-site-summary.ipynb</code></a>. There one can also find a summary of the <strong>computational details</strong> for the paper.</p> <p>We further provide <code>vasprun.xml</code> files for some of the tests of convergence with respect to plane-wave cutoff energy and k-point sampling density. These tests are summarised in the jupyter notebook: <a href="https://nbviewer.jupyter.org/github/Shenton-supplemental/Muons_in_Fe2O3/blob/master/Convergence_tests-ENCUT-KPOINTS.ipynb"><code>Convergence_tests-ENCUT-KPOINTS.ipynb</code></a>.</p> <p>A major source of uncertainty stems from the choice of Hubbard U<sub>eff</sub> correction. We varied U<sub>eff</sub> in the range 3 − 6 eV to gauge the impact of this parameter on the predicted energies and precession frequencies of the four charge-neutral muon-polaron complex states. This analysis is available in the notebook: <code><a href="https://nbviewer.jupyter.org/github/Shenton-supplemental/Muons_in_Fe2O3/blob/master/muons_wrt_U.ipynb">muons_wrt_U.ipynb</a>.</code> Although the numerical values do vary as a function of U<sub>eff</sub>, the qualitative behaviour as well as the ordering of frequencies and energy differences presented in the paper (corresponding to U<sub>eff</sub> = 4 eV) remain robust throughout the range: 3 − 5 eV which is the range typically employed for Fe <em>d</em> states.</p> <p>Finally, in the notebook: <a href="https://nbviewer.jupyter.org/github/Shenton-supplemental/Muons_in_Fe2O3/blob/master/Separating_the_muon-polaron_complex.ipynb"><code>Separating_the_muon-polaron_complex.ipynb</code></a>, we analyse the separation of muon from the polaron in different configurations. Here again we provide the VASP input and output files as well as the code used to analyse these results.</p> <p>These jupyter notebooks may be previewed on <a href="https://github.com/Shenton-supplemental/Muons_in_Fe2O3">github</a> or via the <a href="https://nbviewer.jupyter.org/github/Shenton-supplemental/Muons_in_Fe2O3">jupyter notebook viewer</a>. The latter does a better job of rendering the inline LaTeX and is therefore preferred.</p> <p>Note that all of files are currently compressed to save space. These must be uncompressed before the notebooks will run. In each notebook there is a cell one can run to decompress the files needed for that particular notebook.</p>
Spin wave dispersion of ultra-low damping hematite (α-Fe2O3) at GHz frequencies
<p>Raw data associated to the manuscript ‘’Spin wave dispersion of ultra-low damping hematite (α-Fe<sub>2</sub>O<sub>3</sub>) at GHz frequencies‘’,</p> <p>Physical Review Materials 7, 054407(2023); doi: 10.1103/PhysRevMaterials.7.054407<br> Information about file formats and measurement parameters are described in text files in the specific folders.</p> <p>Paper abstract:<br> Low magnetic damping and high group velocity of spin waves (SWs) or magnons are two crucial parameters for functional magnonic devices. Magnonics research on signal processing and wave-based computation at GHz frequencies focused on the artificial ferrimagnetic garnet Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> (YIG) so far. We report on spin-wave spectroscopy studies performed on the natural mineral hematite (α-Fe<sub>2</sub>O<sub>3</sub>) which is a canted antiferromagnet. By means of broadband GHz spectroscopy and inelastic light scattering, we determine a damping coefficient of 1.1×10<sup>−5</sup> and magnon group velocities of a few 10 km/s, respectively, at room temperature. Covering a large regime of wave vectors up to k≈24 rad/μm, we find the exchange stiffness length to be relatively short and only about 1 Å. In a small magnetic field of 30 mT, the decay length of SWs is estimated to be 1.1 cm similar to the best YIG. Still, inelastic light scattering provides surprisingly broad and partly asymmetric resonance peaks. Their characteristic shape is induced by the large group velocities, low damping and distribution of incident angles inside the laser beam. Our results promote hematite as an alternative and sustainable basis for magnonic devices with fast speeds and low losses based on a stable natural mineral.</p>
Arsenic adsorption modelling: TiO2, Fe2O3 and composite TiO2-Fe2O3 sorbents - detailed characterisation and adsorption data sets
<p>Raw data, example files and templates for the research paper provisionally titled 'Improved Accuracy in the Surface Complexation Modelling of Arsenic on Multicomponent Sorbents Using Low Energy Ion Scattering'</p> <p>Included is</p> <ul> <li>materials characterisation data (TiO2, Fe2O3 and a TiO2-Fe2O3 composite)</li> <li>arsenic(III) and arsenic(V) adsorption data (both adsorption isotherms and pH adsorption edges)</li> <li>potentiometric titration data</li> <li>templates for preparing FITEQL input files from titration data and pH adsorption edges</li> <li>examples of FITEQL input and output files</li> </ul> <p>Characterisation techniques used include BET, XRD, FTIR, zeta potential, DLS, low energy ion scattering (LEIS), XPS and XRF. Data was primarily collected by Jay Bullen between 2016 and 2019, with assistance from named collaborators.</p>
Data for the article "Long-distance spin-transport across the Morin phase transition up to room temperature in the ultra-low damping alpha-Fe2O3 antiferromagnet"
<p>Data for experimental magneto-transport and resonance measurements for the article " Long-distance spin-transport across the Morin phase transition up to room temperature in the ultra-low damping α-Fe2O3 antiferromagnet " (https://arxiv.org/abs/2005.14414)</p>
Data from: Insight into the structural and magnetotransport properties of epitaxial alpha-Fe2O3/Pt(111) heterostructures: The role of the reversed layer sequence
<p>We report on the chemical structure and spin Hall magnetoresistance (SMR) in epitaxial α-Fe<sub>2</sub>O<sub>3</sub>(hematite)(0001)/Pt(111) bilayers with hematite thicknesses of 6 nm and 15 nm grown by molecular beam epitaxy on a MgO(111) substrate. Unlike previous studies that involved Pt overlayers on hematite, the present hematite films were grown on a stable Pt buffer layer and displayed structural changes as a function of thickness. These structural differences (the presence of a ferrimagnetic phase in the thinner film) significantly affected the magnetotransport properties of the bilayers. We observed a sign change of the SMR from positive to negative when the thickness of hematite increased from 6 nm to 15 nm. For α-Fe<sub>2</sub>O<sub>3</sub>(15 nm)/Pt, we demonstrated room-temperature switching of the Néel order with rectangular, nondecaying switching characteristics. Such structures open the way to extending magnetotransport studies to more complex systems with double asymmetric metal/hematite/Pt interfaces.</p>
Data from: Insight into the structural and magnetotransport properties of epitaxial alpha-Fe2O3/Pt(111) heterostructures: The role of the reversed layer sequence
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Data from: The effect of heat treatments on the phase composition and diffraction patterns of goethite to α-Fe2O3/γ-Fe2O3 transformation
<p class="Body"><span>Recovered iron hydroxides from Electro-coagulated (EC) sludge collected from the textile wastewater treatment plant and heat treated forms of iron oxides on phase composition properties and phase identification were reported. EC sludges containing iron hydroxides were examined with heat treatment at a temperature of 100, 300, 500 and 800 <sup>0</sup>C. The raw and analyzed data of the x-ray diffraction examinations of the raw iron hydroxides containing EC sludge and transformed iron oxides were reported. X- ray <em><span>Diffraction </span></em>(XRD) analytical techniques were used for both raw EC sludge and transformed iron oxides, hematite, characteristic determination. Iron oxide (Hematite) diffraction pattern as comparative to International Central Diffraction Data (ICDD) from heat treated at high temperature EC sludge were evaluated and confirmed. Raw and analyzed data of XRD analysis for both recovered iron hydroxides and transformed iron oxides is uploded in the data repository as PDF and XPS viewer.</span></p>
Physico-chemical characterization of sterilized Fe2O3 nanoparticles by XPS / HAXPES / SEM
<p>Here a dataset of XPS, HAXPES and SEM measurements for the physico-chemical characterization of sterilized nanoparticles is presented. The measurements are part of the H2020 project “NanoSolveIT”.</p> <p>Fe<sub>2</sub>O<sub>3</sub> nanoparticles were provided by Promethean Particles and treated differently by project partners from the University of Birmingham (EMR identifiers in the project: ERM00000410, ERM00000452, ERM00000431).</p> <p>The particles were treated by different sterilization methods (autoclave or microwave) and BSA was or was not added as stabilizer. This finally leads to five different samples: pristine, autoclave, microwave, autoclave with BSA, microwave with BSA.</p> <p>Prior to the measurements, the samples were prepared from the solution as drop cast on Si wafers. First SEM and EDS measurements were performed, followed by XPS and HAXPES measurements on the same samples. Here at first survey spectra were recorded followed by high resolution spectra. For XPS / HAXPES several Si-wafers were mounted together on one platen. The platen was left in the intro chamber of the instrument for several hours before the measurement started.</p> <p>Equipment:</p> <p>SEM images were acquired with a <em>Supra 40 </em>(Zeiss) SEM equipped with a <em>Quantax 400 </em>(Bruker) SDD EDS spectrometer.</p> <p>For X-ray spectroscopy experiments, a combined XPS / HAXPES spectrometer (<em>Quantes </em>from ULVAC-PHI) was used, where XPS is measured at 1486.6 eV (monochromatic Al Kα source) and HAXPES at 5414.9 eV (monochromatic Cr Kα source). Here it is possible to perform the measurements at the exact same position.</p> <p>Data:</p> <p>For SEM, the data are given in .tif format. For XPS / HAXPES the raw data are given as .spe (PHI format) and .npl (VAMAS format) files. The measurement conditions are given in the data files.</p> <p>Naming of data:</p> <p>SEM: <em>sample_treatment (n)</em>, with n a consecutive number.</p> <p>XPS / HAXPES: For the .spe files <em>Pn.m.o.sample_treatment</em> and for the corresponding .npl files: <em>m.npl</em> with Pn: platen-number, m: spectrum number (order of the measurements); o: point-number, of the position on the sample, sample_treatment with "m" for microwave and "a" for autoclave.</p> <p>The authors thank Sigrid Benemann, who performed the SEM measurements.</p>
Data from: The effect of heat treatments on the phase composition and diffraction patterns of goethite to α-Fe2O3/γ-Fe2O3 transformation
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Data for article: Antiferromagnetic magnon spintronic based on nonreciprocal and nondegenerated ultra-fast spin-waves in the canted antiferromagnet α-Fe2O3
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the cif file of Fe, γ-Fe2O3 and γ-FeOOH
<p>the cif file of Fe, γ-Fe2O3 and γ-FeOOH</p>
Transcriptomic study of NR8383 rat macrophages cells following exposure to Fe2O3 (NRCWE018)
GEO Series GSE156587. Rattus norvegicus. 4 samples. Type: Expression profiling by array.
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