FS-PEX

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2019-03-11
11:25
OpenAccess [PUBDB-2019-01434] Journal Article
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Role of antisite disorder, electron-electron correlations, and a surface valence transition in the electronic structure of $\mathrm{CeMnNi_{4}}$
$\mathrm{CeMnNi_{4}}$ exhibits an unusually large spin polarization, but its origin has baffled researchers for more than a decade. We use bulk sensitive hard x-ray photoelectron spectroscopy (HAXPES) and density functional theory based on the Green's function technique to demonstrate the importance of electron-electron correlations of both the Ni 3d (U$_{Ni}$) and Mn 3d (U$_{Mn}$) electrons in explaining the valence band of this multiply correlated material [...]
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2019-03-01
12:30
Embargoed OpenAccess [PUBDB-2019-01275] Journal Article
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In Operando Synchrotron Diffraction and in Operando X-ray Absorption Spectroscopy Investigations of Orthorhombic $\mathrm{V_{2}O_{5}}$ Nanowires as Cathode Materials for Mg-Ion Batteries
Orthorhombic $\mathrm{V_{2}O_{5}}$ nanowires were successfully synthesized via a hydrothermal method. A cell-configuration system was built utilizing $\mathrm{V_{2}O_{5}}$ as the cathode and 1 M Mg(ClO$_4$)$_2$ electrolyte within acetonitrile, together with Mg$_x$Mo$_6$S$_8$ (x ≈ 2) as the anode to investigate the structural evolution and oxidation state and local structural changes of $\mathrm{V_{2}O_{5}}$. [...]
Published on 2019-01-17. Available in OpenAccess from 2020-01-17.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-02-28
16:52
Embargoed OpenAccess [PUBDB-2019-01270] Journal Article
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Magnetoelastic coupling at spin-glass-like transition in $\mathrm{Sr_{3}NiSb_{2}O_{9}}$
We report a characteristic spin-glass-like behavior in $\mathrm{Sr_{3}NiSb_{2}O_{9}}$, as confirmed from the low-field dc magnetometry and ac susceptibility measurements. The memory effects in the dc magnetometry exhibit similar characteristic features of the spin-glass systems. [...]
Published on 2018-11-12. Available in OpenAccess from 2019-11-12.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-02-19
08:51
Embargoed OpenAccess [PUBDB-2019-01153] Journal Article
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Self-immobilized Pd nanowires as an excellent platform for a continuous flow reactor: efficiency, stability and regeneration
Nanoscale 10(45), 21396 - 21405 () [10.1039/C8NR06844E]  GO
Despite extensive use of Pd nanocrystals as catalysts, the realization of a Pd-based continuous flow reactor remains a challenge. Difficulties arise due to ill-defined anchoring of the nanocrystals on a substrate and reactivity of the substrate under different reaction conditions. [...]
Published on 2018-10-27. Available in OpenAccess from 2019-10-27.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-02-01
14:34
[PUBDB-2019-00917] Journal Article
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Electrochemical and Thermal Stress of $\mathrm{LiNi_{0.8}Co_{0.15}Al_{0.05}O_{2}}$ Electrodes: Evolution of Aluminum Surface Environments
ECS transactions 80(10), 197 - 206 () [10.1149/08010.0197ecst]  GO
For layered oxide cathodes, aluminum doping has widely been shown to improve performance, particularly at high degrees of delithiation. While this has led to increased interest in Al-doped systems, including $\mathrm{LiNi_{0.8}Co_{0.15}Al_{0.05}O_{2}}$ (NCA), the aluminum surface environment has not been thoroughly investigated. [...]
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2019-02-01
14:13
[PUBDB-2019-00912] Journal Article
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New HAXPES Applications at PETRA III
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2019-02-01
13:53
Embargoed OpenAccess [PUBDB-2019-00907] Journal Article
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Comprehensive 1D and 2D UHV lens changer at PETRA III beamlines
13th International Conference on Synchrotron Radiation Instrumentation, SRI2018, TaipeiTaipei, Taiwan, AIP conference proceedings 2054(1), 060012 () [10.1063/1.5084643]  GO
For beam collimation and focusing at the new PETRA III undulator beamlines, UHV compatible 1D and 2D compound refractive lens changers have been designed. Since these units are going to be integrated in the upstream part of the beamlines in the optics hutches, the primary design goal was to ensure reliability, failsafe operation and convenient optical alignment combined with high mechanical precision. [...]
Published on 2019-01-16. Available in OpenAccess from 2020-01-16.: Download fulltextPDF Download fulltextPDF (PDFA); External link: Download fulltextFulltext
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2019-01-28
14:40
OpenAccess [PUBDB-2019-00805] Journal Article
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Complete agreement of the post-spinel transition with the 660-km seismic discontinuity
The 660-km seismic discontinuity, which is a significant structure in the Earth’s mantle, is generally interpreted as the post-spinel transition, as indicated by the decomposition of ringwoodite to bridgmanite + ferropericlase. All precise high-pressure and high-temperature experiments nevertheless report 0.5–2 GPa lower transition pressures than those expected at the discontinuity depth (i.e [...]
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2019-01-28
13:59
[PUBDB-2019-00796] Journal Article
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Revealing the Influence of Silver in Ni–Ag Catalysts on the Selectivity of Higher Olefin Synthesis from Stearic Acid
Results on the conversion of stearic acid to olefins over Ni–Ag/γ-Al$_2$O$_3$ catalysts are presented. XANES and EXAFS experiments in situ and DFT calculations were applied to reveal the structure of active sites therein. [...]
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2019-01-28
11:54
OpenAccess [PUBDB-2019-00772] Journal Article
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The Mechanism of Low-Temperature Oxidation of Carbon Monoxide by Oxygen over the $\mathrm{PdCl_{2}–CuCl_{2}/γ-Al_{2}O_{3}}$ Nanocatalyst
Nanomaterials 8(4), 217 () [10.3390/nano8040217]  GO
The state of palladium and copper on the surface of the PdCl$_2$–CuCl$_2$/γ-Al$_2$O$_3$ nanocatalyst for the low-temperature oxidation of CO by molecular oxygen was studied by various spectroscopic techniques. Using X-ray absorption spectroscopy (XAS), powder X-ray diffraction (XRD), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), freshly prepared samples of the catalyst were studied [...]
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