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23 results for “spinel”
Dataset of "Preparation of novel lithiated high-entropy spinel type oxyhalides and their electrochemical performance in Li-ion batteries "
<p>Electrochemical measurements carried out using the 2032-coin cells with the Li-metal anode have shown voltammetric charge capacities of 450, 694, and 593 mAh g-1 for HEOFe, LiHEOFeCl, and LiHEOFeF, respectively.<br>Galvanostatic chronopotentiometry at 1 C rate confirmed high initial charge capacities for all the samples but galvanostatic curves exhibited a capacity decay over 100 charging/discharging cycles. Raman spectroelectrochemistry measured on the LiHEOFeF sample proved the reversibility of the electrochemical process for initial charging/discharging cycles. Electrochemical impedance spectroscopy revealed the lowest initial charge transfer resistance for LiHEOFeCl and its gradual decrease both for LiHEOFeCl and LiHEOFeF during galvanostatic cycling, whereas the charge transfer resistance of HEOFe slightly increases over 100 galvanostatic cycles due to different mechanism of the electrochemical reduction. </p>
Dataset of "Spinel Glass Fibers for Application in Solid-State Batteries"
<p>All-solid-state batteries are currently considered one of the most reliable battery systems, as they are nonflammable and do not form dendrites during the charging cycle, unlike liquid electrolyte batteries. Additionally, they are expected to offer higher energy density compared to current batteries. This work focuses on the preparation of a material that could serve as a cathode in all-solid-state batteries. The cathode material was obtained from end-of-life batteries, which enabled its reuse, and was used as a filler in glassy nano/micro-fibers prepared by electrospinning. Using the material in the form of nano/micro-fibers is expected to shorten the diffusion lengths of lithium ions, increase capacity, and improve the flexibility and stability of the material during cycling.</p>
Dataset of "Nickel-cobalt spinel-based oxygen evolution electrode for zinc-air flow battery"
<p>Following dataset provides all measured data that were collected on nickel (Ni) based electrodes for the oxygen evolution reaction. The electrodes were following: nickel (Ni) pristine mesh (PM), catalysed mesh (CM), nickel pristine foam (PF), catalysed foam (CF). Catalyst was NiCo2O4. Firstly, the catalysed electrodes were prepared and characterized by SEM, EDS and XRD. The electrodes were characterized in three different arrangements: in electrolysis non-flow arrangement, in a flow electrolysis cell and in ZAFB according to the manuscript.</p>
Data for the publication "MgB2Se4 Spinels (B = Sc, Y, Er, Tm) as Potential Mg-Ion Solid Electrolytes – Partial Ionic Conductivity and the Ion Migration Barrier"
<h1><strong>Description Datasets</strong></h1> <p>Datasets are obtained from X-ray diffraction (XRD), Rietveld analysis, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR) spectroscopy, electrochemical impedance spectroscopy (EIS), chronoamperometry (CA), chronopotentiometry (CP) and linear sweep voltammetry (LSV).</p> <h1><strong>Abstract</strong></h1> <p>The magnesium chalcogenide spinel MgSc~2~Se~4~ with high Mg-ion room-temperature conductivity has recently attracted interest as solid electrolyte for magnesium ion batteries. Its ionic/electronic mixed-conducting nature and the influence of the spinel composition on the conductivity and Mg^2+^ migration barrier are yet not well understood. Here, results from a combined experimental and computational study on four MgB~2~Se~4~ spinels (B = Sc, Y, Er, Tm) are presented. The room-temperature ionic conductivities (<em>σ</em>~ion~ = 2x10^–5^–7x10^–5^ S cm^–1^) of the spinels are accurately measured, as electron transport is effectively suppressed by purely Mg-ion conducting electrode interlayers. Using the same approach, reversible Mg plating/stripping as well as good electrochemical stability are achieved. Driven by the good accordance of the computationally and experimentally obtained Mg^2+^ migration barriers <em>E</em>~a~(th) and <em>E</em>~a~, respectively, further periodic density functional calculations are performed on the MgB~2~Se~4~ spinel system, revealing the role of trigonal distortion on the migration path geometry and <em>E</em>~a~(th). These findings provide deeper understanding how to reach small Mg^2+^ migration barriers <em>E</em>~a~ in the MgB~2~Se~4~ spinels.</p>
Effect of periodicity on the magnetic anisotropy in spinel oxide superlattices
<p>Open data for "Effect of periodicity on the magnetic anisotropy in spinel oxide superlattices" published in Phys. Rev. B <strong>108</strong>, 104426 (2023).</p> <p>URL: https://doi.org/10.1103/PhysRevB.108.104426<br> DOI: https://doi.org/10.1103/PhysRevB.108.104426</p>
Video 8.1 Spinel M26
<p><strong>Video 8.1 Spinel M26 </strong>LA-ICP-MS trace element accessory mineral maps, Trondheimskleber sample RC180405 </p> <p>In these maps, the darkest purple colours indicate very low (or absent) concentrations of the element for that map. With increasing concentrations of that element, the colour changes across the spectrum from purple through blue, with the brightest cyan tones indicating "very high" concentrations of that element, with respect to the total amounts of that element measured for each sample. For the trace elements the highest concentrations may be only a few ppm, yet still be represented by the bright blue shades for one or more crystals, in contrast to the total absence (very dark purple to black), or much lower levels (brighter purple) of the other crystals analysed. Therefore, the below list of element concentration maps included in this film also indicates which of these elements are the major elements (dominate) of a given crystal, and which are trace elements. </p> <p>The video sequence (approximate times) is: </p> <ul> <li>00:00 The locations of Klungen and Bakkaune steatite quarries</li> <li>00:10 Trondheimskleber hand sample RC180405 from either lungen or Bakkaune quarry</li> <li>00:12 reflected light image of the network of Fe-oxide crystals, two spinel crystals, and the matrix minerals analysed as map M26,</li> <li>00:14 Cr (minor amounts in the spinel crystals, trace amounts in the Fe-oxide, absent in the matrix minerals)</li> <li>00:17 Fe (dominate in the Fe-oxide and spinel crystals)</li> <li>00:19 Co (trace amounts, concentrated in the core of one of the spinel crystals and higher in the chlorite than in the Fe oxide)</li> <li>00:22 V (trace amounts in both the Fe-oxide and the spinel)</li> <li>00:24 Al (dominate in the chlorite)</li> <li>00:26 Zn (trace amounts, only in the core of the spinel crystal)</li> <li>00:28 Mn (trace amounts, concentrated in the spinel core, slight lower in the chlorite, and absent in the Fe-oxide)</li> <li>00:30 Mg (dominate in the chlorite and talc, absent in the spinel and Fe-oxide).</li> <li>00:34 the reflected light image of the crystals (repeated)</li> <li>00:36 A collage of all of those maps surrounding the reflected light image.</li> </ul>
Video 7.3 Spinel M18
<p><strong>Video 7.3 Spinel M18</strong> LA-ICP-MS trace element accessory mineral maps, Handöl quarry, sample RC180801 </p> <p>In these maps, the darkest purple colours indicate very low (or absent) concentrations of the element for that map. With increasing concentrations of that element, the colour changes across the spectrum from purple through blue, with the brightest cyan tones indicating "very high" concentrations of that element, with respect to the total amounts of that element measured for each sample. For the trace elements the highest concentrations may be only a few ppm, yet still be represented by the bright blue shades for one or more crystals, in contrast to the total absence (very dark purple to black), or much lower levels (brighter purple) of the other crystals analysed. Therefore, the below list of element concentration maps included in this film also indicates which of these elements are the major elements (dominate) of a given crystal, and which are trace elements. </p> <p>The video sequence (approximate times) is: </p> <ul> <li>00:00 The location of Handöl quarry</li> <li>00:11 Photo of Handöl quarry</li> <li>00:14 hand sample RC180801 from Handöl quarry</li> <li>00:17 reflected light image of the spinel crystal and Fe-oxide overgrowth analysed as map M18</li> <li>00:19 Cr trace amounts in spinel)</li> <li>00:22 Fe dominant in the Fe-oxide, and in the gap between the two lobes of the core (spinel A), minor in the spinel)</li> <li>00:24 Co trace amounts, highest in the core, slightly lower in the spinel overgrowth (spinel A) then decreasing steadily towards the rim of the Fe-oxide)</li> <li>00:26 V trace amounts, highest in the spinel B overgrowth layers, lower in the core, and levels in between those for the Fe-oxide rim)</li> <li>00:28 Al dominant in the chlorite, minor in the core, spinel A), but basically absent in the spinel B overgrowth and the Fe-oxide)</li> <li>00:30 Ni absent in the core (spinel A), trace amounts in the spinel B overgrowth, slightly higher in the Fe-oxide, talc, and chlorite)</li> <li>00:33 Mn minor amounts in both spinel layers, trace amounts in the Fe-oxide and carbonate)</li> <li>00:35 Ti trace amounts in the spinel B overgrowth, and in the carbonate). </li> <li>00:37 the reflected light image of the crystals (repeated)</li> <li>00:39 a collage of all of the above trace element maps surrounding the reflected light image.</li> </ul>
Video B.8 Spinel M19
<p><strong>Video B.8 Spinel M19</strong> LA-ICP-MS trace element accessory mineral maps, Laisholm quarry, sample RC180301 </p> <p>In these maps, the darkest purple colours indicate very low (or absent) concentrations of the element for that map. With increasing concentrations of that element, the colour changes across the spectrum from purple through blue, with the brightest cyan tones indicating "very high" concentrations of that element, with respect to the total amounts of that element measured for each sample. For the trace elements the highest concentrations may be only a few ppm, yet still be represented by the bright blue shades for one or more crystals, in contrast to the total absence (very dark purple to black), or much lower levels (brighter purple) of the other crystals analysed. Therefore, the below list of element concentration maps included in this film also indicates which of these elements are the major elements (dominate) of a given crystal, and which are trace elements. </p> <p>The video sequence (approximate times) is: </p> <ul> <li>00:00 The location of Laisholm quarry</li> <li>00:09 hand sample RC180301 from Laisholm quarry</li> <li>00:12 reflected light image of the spinel crystal and Fe-oxide overgrowth analysed as map M19</li> <li>00:14 Cr ( trace amounts in both the spinel layers)</li> <li>00:17 Fe ( minor amounts in the spinel layers, dominant in the Fe-oxide)</li> <li>00:19 Co ( trace amounts in the spinel layers)</li> <li>00:21 V ( trace amounts, higher in the two lobes of spinel A crystal core, slightly lower in the spinel B overgrowth, and even lower in the Fe-oxide)</li> <li>00:23 Zn ( trace amounts in both spinel layers)</li> <li>00:26 Al ( dominant in the lobes of the core </li> <li>00:28 Mn ( trace amounts in both spinel layers)</li> <li>00:31 As ( trace amounts in the cracks of the large crystal). </li> <li>00:34 the reflected light image of the crystals (repeated)</li> <li>00:36 a collage of all of the above trace element maps surrounding the reflected light image.</li> </ul>
Deformation of post-spinel under the lower mantle conditions
<p>Data used in</p> <p> </p> <p><strong>Deformation of post-spinel under the lower mantle conditions</strong></p> <p>F. Xu<sup>1, 2</sup>, D. Yamazaki<sup>1</sup>, S. A. Hunt<sup>3, 2</sup>, N. Tsujino<sup>1</sup>, Y. Higo<sup>4</sup>, Y. Tange<sup>4</sup>, K. Ohara<sup>4</sup>, D. P. Dobson<sup>2</sup></p> <p><sup>1</sup> Institute for Planetary Materials, Okayama University, Misasa, 682-0193 Tottori, Japan</p> <p><sup>2</sup> Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom</p> <p><sup>3</sup> Department of Materials, University of Manchester, Sackville Street Building, Manchester M1 3BB, United Kingdom</p> <p><sup>4</sup> Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan</p>
Supplementary Datasets for 'Exploring rift geodynamics in Ethiopia through olivine-spinel Al-exchange thermometry and rare-earth element distributions'
<p>Supplementary Datasets for 'Exploring rift geodynamics in Ethiopia through olivine-spinel Al-exchange thermometry and rare-earth element distributions'.</p> <p>Dataset S1: Qualitative X-ray maps of Mg, Ca, Al, Ni, P in olivine-spinel pairs.<br> Dataset S2: Quantitative EPMA point analyses of olivine and spinel. Includes Sheet 1: Secondary standards; Sheet 2: Sample data.<br> Dataset S3: Full inversion outputs from MultiNest.</p>
Appendix A1 for The olivine-spinel-aSiO2(melt) (OSaS) oxybarometer: A new method for evaluating magmatic oxygen fugacity in olivine-phyric basalts
<p>This repository item contains the code, inputs and benchmarking files for "The olivine-spinel-aSiO2(melt) (OSaS) oxybarometer: A new method for evaluating magmatic oxygen fugacity in olivine-phyric basalts" by Bell, Waters and Ghiorso (2024) in American Mineralogist.</p>
Determination of the spinel content in cycled Li1.2Ni0.13Mn0.54Co0.13O2 using three-dimensional electron diffraction and precession electron diffraction
<p>(hkl,I)-lists for the 150 times cycled NMC material</p>
Structure files of La doped Co spinel
<p>The CIF files for La doped Co spinel at (111) (110) and (100) facets, used for Pourbaix diagram calculation</p>
La and Mn-doped cobalt spinel oxygen evolution catalyst for proton exchange membrane electrolysis
<p>Finding electrocatalysts using earth-abundant materials as a replacement to iridium for oxygen-evolution reaction (OER) in proton exchange membrane water electrolyzer (PEMWE) represents a critical step in reducing the cost for green hydrogen production. We report here a nanofibrous cobalt spinel catalyst co-doped with lanthanum and manganese prepared from zeolitic imidazolate framework embedded in electrospun polymer fiber. The catalyst demonstrated a low overpotential of 353 millivolts at 10 milliamperes per square centimeter and a low degradation for OER over 360 hours in acidic electrolyte. PEMWE containing this catalyst at anode demonstrated a current density of 2000 milliamperes per square centimeter at 2.47 volts (Nafion® 115 membrane) or 4000 milliamperes per square centimeter at 3.00 volt (Nafion® 212 membrane), and low degradation in accelerated-stress-test. High-resolution electronic microscopy and operando X-ray absorption spectroscopy, combined with computational modeling, revealed the different functions of lanthanum, manganese, and cobalt in enabling enhanced activity, conductivity and acidic tolerance within the OER operating window.</p>
La and Mn-doped cobalt spinel oxygen evolution catalyst for proton exchange membrane electrolysis
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Luna 20 spinel-bearing lithic fragments
<p>The Luna 20 mission returned samples from the Hilly and Furrowed Terrain of the Moon that is associated with the impact event that formed the Crisium Basin. This event potentially excavated deep crustal and upper mantle lithologies. Spinel is commonly considered to be a mineralogical indicator of rocks of high-pressure origin, and orbital data indicate the presence of spinel-bearing lithologies exterior to the basin. We have examined 166 Luna 20 particles in the 250-500 µm size range and found 31 spinel-bearing fragments. Of these 10 are igneous plutonic Mg-suite rocks, most of which are troctolitic, and 16 are impact melt rocks. The other five are fused soil or devitrified glass fragments. The spinel-bearing lithic fragments are plagioclase-rich and do not have the high modal abundances of Mg-Al spinel previously identified in the region through remote sensing analyses. The textures, compositions, and inferred crystallization sequences of the present magmatic spinel-bearing samples are most consistent with a relatively shallow crustal (rather than a deep crustal) origin, with a petrogenesis involving the assimilation of ferroan anorthosite crust by Mg-rich, mantle-derived magmas. Both relict and newly-formed spinels are found in impact melt rocks and are also inferred to have formed at relatively low pressures. Thus, the presence of spinel is not an unambiguous indicator of mantle or deep crustal material. The insights gained from this study show that studies of a small, robotically collected sample can improve our understanding of regional lithologies and petrologic processes.</p>
Research Data for "Electronic structure and stability of the active surface phase of NixCo3-xO4 spinel alkaline O2 evolution electrocatalysts: from an epitaxial model catalyst perspective"
<p>These datasets support main text and supplementary figures and tables of the paper "Electronic structure and stability of the active surface phase of NixCo3-xO4 spinel alkaline O2 evolution electrocatalysts: from an epitaxial model catalyst perspective" appearing in <em>ACS Applied Energy Materials </em>under DOI: <a href="https://doi.org/10.1021/acsaem.4c01688">https://doi.org/10.1021/acsaem.4c01688 </a></p>
Luna 20 spinel-bearing lithic fragments
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Data from: Effect of graphene on rate capability of spinel LTO as an anode material for Li-ion battery
Spinel structured Li4Ti5O12 (LTO) is one of the most promising candidate anode material for Li-ion battery known as zero strain material, it has poor intrinsic electronic properties. In order to enhance it, graphene was used as additive. The LTO and graphene composites were synthesized by reduction process of graphene oxide via hydrothermal treatment. The powders were characterized by X-Ray diffraction (XRD), Infrared spectroscopy (FT-IR). For the galvanostatic discharge and charge measurements were performed at room temperature against Li/Li+ metal electrode.
Data from: Effect of graphene on rate capability of spinel LTO as an anode material for Li-ion battery
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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