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2017-11-15
09:36
DBCoverage [PUBDB-2017-12009] Journal Article
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Spiral scanning X-ray fluorescence computed tomography
Optics express 25(19), 23424 - 23436 (2017) [10.1364/OE.25.023424]  GO
ddc:530
canning X-ray fluorescence tomography was once considered impractical due to prohibitive measurement time requirements but is now common for investigating metal distributions within small systems. A recent look-ahead to the possibilities of 4$^{th}$-generation synchrotron light sources [J [...]
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2017-11-09
18:02
OpenAccess [PUBDB-2017-11841] Journal Article
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Towards in situ determination of 3D strain and reorientation in the interpenetrating nanofibre networks of cuticle
Nanoscale 9(31), 11249 - 11260 (2017) [10.1039/C7NR02139A]  GO
ddc:600
Determining the in situ 3D nano- and microscale strain and reorientation fields in hierarchical nanocomposite materials is technically very challenging. Such a determination is important to understand the mechanisms enabling their functional optimization [...]
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2017-11-09
10:16
[PUBDB-2017-11799] Journal Article
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Probing Transient Valence Orbital Changes with Picosecond Valence-to-Core X-ray Emission Spectroscopy
ddc:540
We probe the dynamics of valence electrons in photoexcited [Fe(terpy)$_2$]$^{2+}$ in solution to gain deeper insight into the Fe−ligand bond changes. We use hard X-rayemission spectroscopy (XES), which combines element specificity and high penetration with sensitivity to orbital structure, making it a powerful technique for molecular studies in a wide variety of environments. [...]
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2017-10-30
14:18
OpenAccess [PUBDB-2017-11630] Journal Article
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Iridium double perovskite $Sr_{2}YIrO_{6}$ : A combined structural and specific heat study
ddc:530
Recently, the iridate double perovskite Sr2YIrO6 has attracted considerable attention due to the report of unexpected magnetism in this Ir$^{5+}$ (5d$^{4}$) material, in which according to the J$_{eff}$ model, a nonmagnetic ground state is expected. However, in recent works on polycrystalline samples of the series Ba$_{2-x}$Sr$_{x}$YIrO$_{6}$ no indication of magnetic transitions have been found [...]
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2017-10-30
14:08
[PUBDB-2017-11625] Journal Article
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In Situ X-ray Diffraction Studies on the De/rehydrogenation Processes of the K$_{2}$[Zn(NH$_{2}$)$_{4}$]-8LiH System
ddc:540
In this work, the hydrogen absorption and desorption properties of the system K$_2$[Zn(NH$_2$)$_4$]-8LiH are investigated in detail via in situ synchrotron radiation powder X-ray diffraction (SR-PXD), Fourier transform infrared spectroscopy (FT-IR), and volumetric methods. Upon milling, K$_2$[Zn(NH$_2$)$_4$] and 8LiH react to form 4LiNH$_2$-4LiH-K$_2$ZnH$_4$, and then 4LiNH$_2$-4LiH-K$_2$ZnH$_2$ releases H$_2$ in multiple steps [...]
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2017-10-30
13:32
OpenAccess [PUBDB-2017-11623] Journal Article
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Pressure tuning of bond-directional exchange interactions and magnetic frustration in the hyperhoneycomb iridate $\beta$−Li$_{2}$IrO$_{3}$
ddc:530
We explore the response of Ir 5d orbitals to pressure in $\beta$−Li$_{2}$IrO$_{3}$, a hyperhoneycomb iridate in proximity to a Kitaev quantum spin-liquid (QSL) ground state. X-ray absorption spectroscopy reveals a reconstruction of the electronic ground state below 2 GPa, the same pressure range where x-ray magnetic circular dichroism shows an apparent collapse of magnetic order [...]
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2017-10-30
13:29
[PUBDB-2017-11622] Journal Article
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Structural properties of the thermoelectric material CuCrS$_{2}$ and of deintercalated Cu$_{x}$ CrS$_{2}$ on different length scales: X-ray diffraction, pair distribution function and transmission electron microscopy studies
ddc:540
We report on the structural alterations of the thermoelectric material CuCrS$_{2}$ introduced by the removal of 1/3 of the Cu$^+$ ions which are located between CrS$_2$ layers. X-ray diffraction (XRD) and pair distribution function (PDF) analyses revealed a newly formed Cu$_{0.66}$CrS$_2$ phase with monoclinic symmetry and a 3a superstructure [...]

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2017-10-30
13:26
[PUBDB-2017-11620] Journal Article
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Acoustic Emission from Organic Martensites
ddc:540
In salient effects, still crystals of solids that switch between phases acquire a momentum and are autonomously propelled because of rapid release of elastic energy accrued during a latent structural transition induced by heat, light, or mechanical stimulation. When mechanical reconfiguration is induced by change of temperature in thermosalient crystals, bursts of detectable acoustic waves are generated prior to self-actuation [...]
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2017-10-30
13:16
[PUBDB-2017-11615] Journal Article
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Devitrification and hydrogen storage capacity of the eutectic Ca$_{72}$Mg$_{28}$ metallic glass
ddc:670
Very low density eutectic Ca$_{72}$Mg$_{28}$ at.% metallic glass was produced by a rapid solidification melt-spinning process. The glass is considered as being a precursor of more complex ternary Ca-Mg-Zn alloys consisting solely of biocompatible elements with the view to its potential use as bioresorbable alloy for orthopaedic applications [...]
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2017-10-30
13:11
[PUBDB-2017-11612] Journal Article
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Synthesis, structures and thermal decomposition of ammine M$_{x}$B$_{12}$H$_{12}$ complexes (M = Li, Na, Ca)
Dalton transactions 46(24), 7770 - 7781 (2017) [10.1039/C7DT01414G]  GO
ddc:540
A series of ammine metal-dodecahydro-closo-dodecaboranes, M$_{x}$B$_{12}$H$_{12}$·nNH$_3$ (M = Li, Na, Ca) were synthesized and their structural and thermal properties studied with in situ time-resolved synchrotron radiation powder X-ray diffraction, thermal analysis, Fourier transformed infrared spectroscopy, and temperature-programmed photographic analysis. The synthesized compounds, Li$_2$B$_{12}$H$_{12}$·7NH$_{3}$, Na$_{2}$B$_{12}$H$_{12}$·4NH$_{3}$ and CaB$_{12}$H$_{12}$·6NH$_{3}$, contain high amounts of NH$_{3}$, 43.3, 26.6 and 35.9 wt% NH$_{3}$, respectively, which can be released and absorbed reversibly at moderate conditions without decomposition, thereby making the closo-boranes favorable ‘host’ materials for ammonia or indirect hydrogen storage in the solid state [...]

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