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2017-07-20
16:51
[PUBDB-2017-08100] Journal Article
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Microsecond Structural Rheology
ddc:530
The relationship between the local structure of complex liquids and their response to shear is generally not well understood. This concerns, in particular, the formation of particle strings in the flow direction or hydroclusters, both important for the understanding of shear thinning and thickening phenomena [...]
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2017-07-19
14:45
[PUBDB-2017-07989] Journal Article
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Disentangling magnetic order on nanostructured surfaces

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2017-07-12
16:39
OpenAccess [PUBDB-2017-07482] Journal Article
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In situ luminescence analysis: a new light on monitoring calcium phosphate phase transitions
ddc:540
In this work, in situ luminescence analysis was applied for the first time for monitoring the phase transitions of calcium phosphate (CaP) and confirmed by synchrotron in situ X-ray diffraction in addition to in situ infrared spectroscopy, with simultaneous measurements of pH and ion conductivity. Applying doped Ce$^{3+}$ and Eu$^{3+}$ as local coordination sensors, the high sensitivity of their emission spectra upon the changes in the coordination sphere of the doped cation sites enabled to detect the formation of amorphous calcium phosphate (ACP) and Ca$_5$(PO$_4$)$_3$OH, besides their subsequent transitions to CaHPO$_4$·2H$_2$O and Ca$_8$H$_2$(PO$_4$)$_6$·5H$_2$O under real reaction conditions [...]
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2017-07-06
10:41
OpenAccess [PUBDB-2017-06977] Journal Article
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Critical behavior of Mg$_{1–x}$Fe$_{x}$O at the pressure-induced iron spin-state crossover
ddc:530
We present a high-pressure study of Mg$_{1–x}$Fe$_{x}$O (ferropericlase, Fp) single crystals 0.04(1)$\leqslant x \leqslant$ 0.33(1) with a focus on ferrous iron spin-state crossover and the material behavior preceding it. Using Vegard's law and highly accurate high-pressure single-crystal experimental data, we extract the lattice parameter $a^{HS}_{FeO}$ of the “FeO high spin lattice contribution” in the MgO-FeO solid solution. [...]
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2017-07-06
10:23
[PUBDB-2017-06974] Journal Article
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Structural and magnetic properties of Cr$_{2}$O$_{3}$ at high pressure
ddc:670
The structural and magnetic properties of Cr$_{2}$O$_{3}$ have been studied by means of X-ray and neutron powder diffraction at high pressures up to 35 GPa. The lattice compression of the rhombohedral crystal structure of R $\bar{3}$c symmetry is slightly anisotropic with anomaly in the pressure behavior of the c/a parameters ratio at P $\approx$ 20 GPa of presumably magnetic nature [...]
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2017-07-01
16:38
[PUBDB-2017-06548] Journal Article
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Rapid cadmium SAD phasing at the standard wavelength (1Å)
ddc:570
Cadmium ions can be effectively used to promote crystal growth and for experimental phasing. Here, the use of cadmium ions as a suitable anomalous scatterer at the standard wavelength of 1 Å is demonstrated. [...]
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2017-06-26
13:32
[PUBDB-2017-06100] Journal Article
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New materials for high-energy-resolution x-ray optics
Energy quarterly 42(06), 424 - 429 (2017) [10.1557/mrs.2017.94]  GO
ddc:333.7
The use of crystals other than silicon for x-ray optics is becoming more common for many challenging experiments such as resonant inelastic x-ray scattering and nuclear resonant scattering. As more—and more specialized—spectrometers become available at many synchrotron radiation facilities, interest in pushing the limits of experimental energy resolution has increased [...]
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2017-06-26
12:34
OpenAccess [PUBDB-2017-06090] Journal Article
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Nuclear Resonant Surface Diffraction of Synchrotron Radiation
ddc:550
Nuclear resonant x-ray diffraction in grazing incidence geometry is used to determine the lateral magnetic configuration in a one-dimensional lattice of ferromagnetic nanostripes. During magnetic reversal, strong nuclear superstructure diffraction peaks appear in addition to the electronic ones due to an antiferromagnetic order in the nanostripe lattice [...]
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2017-06-23
10:06
OpenAccess [PUBDB-2017-05924] Journal Article
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Statistical properties of a free-electron laser revealed by Hanbury Brown?Twiss interferometry
ddc:530
We present a comprehensive experimental analysis of statistical properties of the self-amplified spontaneous emission free-electron laser (FEL) FLASH by means of Hanbury Brown and Twiss interferometry. The experiments were performed at FEL wavelengths of 5.5, 13.4, and 20.8 nm [...]
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2017-06-21
17:27
[PUBDB-2017-05801] Journal Article
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High-pressure behavior of $(Cs,K)Al_{4}Be_{5}B_{11}O_{28}$ (londonite): A single-crystal synchrotron diffraction study up to 26 GPa
ddc:660
The compressional behavior and the P-induced deformation mechanisms at theatomic scale of (Cs,K)Al4Be5B11O28(londonite, a ~7.31A and space groupP43m) were investigated by in situ single-crystal synchrotron X-ray diffractionwith a diamond anvil cell up to 26 GPa. No phase transition was observ ed withinthe P-range investigated: this material exhibits isotropi c compression (i.e., withcubic symmetry) in response to the applied pressure. [...]
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