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2018-02-08
13:51
OpenAccess [PUBDB-2018-01139] Journal Article
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Quantized Self-Assembly of Discotic Rings in a Liquid Crystal Confined in Nanopores
ddc:550
Disklike molecules with aromatic cores spontaneously stack up in linear columns with high, one-dimensional charge carrier mobilities along the columnar axes, making them prominent model systems for functional, self-organized matter. We show by high-resolution optical birefringence and synchrotron-based x-ray diffraction that confining a thermotropic discotic liquid crystal in cylindrical nanopores induces a quantized formation of annular layers consisting of concentric circular bent columns, unknown in the bulk state. [...]
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2018-01-24
16:35
OpenAccess [PUBDB-2018-00789] Bachelor Thesis
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Nanostrukturierung durch Sprühdeposition
82 pp. (2017) [10.3204/PUBDB-2018-00789] = Bachelorarbeit, University of Hamburg, 2017  GO
Diese Bachelorarbeit wurde unter der Leitung von Prof. Dr. [...]
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2018-01-17
15:59
OpenAccess [PUBDB-2018-00674] Journal Article
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Near-K -edge single, double, and triple photoionization of $C^{+}$ ions
ddc:530
Single, double, and triple ionization of the $C^{+}$ ion by a single photon have been investigated in the energy range 286 to 326 eV around the K-shell single-ionization threshold at an unprecedented level of detail. At energy resolutions as low as 12 meV, corresponding to a resolving power of 24 000, natural linewidths of the most prominent resonances could be determined [...]
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2018-01-12
15:44
[PUBDB-2018-00633] Journal Article
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Radial Growth of Self-Catalyzed GaAs Nanowires and the Evolution of the Liquid Ga-Droplet Studied by Time-Resolved in Situ X-ray Diffraction
ddc:540
We report on a growth study of self-catalyzed GaAs nanowires based on time-resolved in situ X-ray structure characterization during molecular-beam-epitaxy in combination with ex situ scanning-electron-microscopy. We reveal the evolution of nanowire radius and polytypism and distinguish radial growth processes responsible for tapering and side-wall growth. [...]
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2018-01-12
10:22
OpenAccess [PUBDB-2018-00593] Journal Article
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Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning
ddc:500
Free-electron lasers providing ultra-short high-brightness pulses of X-ray radiation have great potential for a wide impact on science, and are a critical element for unravelling the structural dynamics of matter. To fully harness this potential, we must accurately know the X-ray properties: intensity, spectrum and temporal profile [...]
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2018-01-12
09:43
Embargoed OpenAccess [PUBDB-2018-00582] Journal Article
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Structural and Magnetic Transitions in CaCo$_{3}$V$_{4}$O$_{12}$ Perovskite at Extreme Conditions
ddc:540
We investigated the structural, vibrational, magnetic, and electronic properties of the recently synthesized CaCo$_{3}$V$_{4}$O$_{12}$ double perovskite with the high-spin (HS) Co$^{2+}$ ions in a square-planar oxygen coordination at extreme conditions of high pressures and low temperatures. The single-crystal X-ray diffraction and Raman spectroscopy studies up to 60 GPa showed a conservation of its cubic crystal structure but indicated a crossover near 30 GPa. [...]
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2018-01-12
08:18
Embargoed OpenAccess [PUBDB-2018-00573] Journal Article
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Ir–Re binary alloys under extreme conditions and their electrocatalytic activity in methanol oxidation
ddc:670
The formation of the hcp-Ir$_{0.70}$Re$_{0.30}$ alloy from the single-source precursor (NH4)2[Ir$_{0.70}$Re$_{0.30}$Cl$_6$] upon heating in hydrogen atmosphere can be associated with the formation of two intermediates: a crystalline iridium-based intermediate and a fcc-structured alloy. Ir–Re alloys show lower thermal expansion coefficients and smaller compressibility in comparison with individual metals. [...]
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2018-01-11
15:47
OpenAccess [PUBDB-2018-00542] Journal Article
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Synthesis of a polar ordered oxynitride perovskite
ddc:530
For decades, numerous attempts have been made to produce polar oxynitride perovskites, where some of the oxygen is replaced by nitrogen, but a polar ordered oxynitride has never been demonstrated. Caracas and Cohen [Appl [...]
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2018-01-11
15:41
OpenAccess [PUBDB-2018-00538] Journal Article
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Stability of iron-bearing carbonates in the deep Earth’s interior
ddc:500
The presence of carbonates in inclusions in diamonds coming from depths exceeding 670 km are obvious evidence that carbonates exist in the Earth’s lower mantle. However, their range of stability, crystal structures and the thermodynamic conditions of the decarbonation processes remain poorly constrained [...]
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2018-01-11
13:12
[PUBDB-2018-00481] Journal Article
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Thermal behavior and decomposition of cerium(III) butanoate, pentanoate and hexanoate salts upon heating in argon
ddc:660
The thermal behavior and decomposition of Ce-butanoate monohydrate (Ce(C3H7CO2)3·H2O), Ce-pentanoate (Ce(C4H9CO2)3) and Ce-hexanoate (Ce(C5H11CO2)3) were studied in a flow of argon while heating at 5 °C/min. By means of several techniques such as simultaneous TG-DTA, FTIR evolved gas analysis, in-situ x-ray diffraction using a synchrotron source and hot-stage microscopy, it was found that all three compounds undergo melting transitions prior to decomposition and that decomposition involves intermediate stages including at least a Ce2O(CnH2n+1CO2)4 intermediate (n = 3, 4 or 5 for Ce-butanoate, pentanoate or hexanoate respectively). [...]
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