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51.
Rueff JP Hague CF Mariot JM Journel L Delaunay R Kappler JP Schmerber G Derory A Jaouen N Krill G 《Physical review letters》2004,93(6):067402
Resonant inelastic x-ray scattering spectra were measured for a series of Ce solid solutions (Ce-Th and Ce-Sc) across the gamma-alpha phase transition. They reveal a well-defined feature associated with the 4f2 configuration when the incident energy is tuned to the Ce L3 preedge region. This component is normally hidden in x-ray absorption spectra because of lifetime broadening. The f1/f2 ratio estimated by resonant inelastic x-ray scattering presents a sharp drop across the gamma-alpha transition and hysteresis as a function of temperature that closely resemble the magnetization loop. These measurements confirm recent dynamical mean-field theory calculations that unexpectedly predict significant double occupancy of f orbitals in the ground state. 相似文献
52.
Dr. H. G. Grewe Prof. Dr. E. Kappler H. Pflugmacher E. Schneider W. Weiser 《Zeitschrift für Physik A Hadrons and Nuclei》1969,224(1-3):85-101
The isochronal and isothermal recovery of the electrical resistivity after large homogeneous compression of copper and silver was measured with a low frequency eddy current method. Two relations between the recovery data and the flow stress were found: 1. For high purity copper and silver the recovery of the electrical resistivity with recrystallization is proportional to the square of the flow stress. 2. The temperature at which half of the resistivity decrease with recrystallization is reached may be related to the flow stressσ by the equation \(\sigma ^2 e^{ - a/T_R } = const\) . The present experiments indicate that a simple relation between the quantitya and the activation energy for recrystallization cannot be given. 相似文献
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54.
Versatile variable temperature insert at the DEIMOS beamline for in situ electrical transport measurements 下载免费PDF全文
L. Joly B. Muller E. Sternitzky J.-G. Faullumel A. Boulard E. Otero F. Choueikani J.-P. Kappler M. Studniarek M. Bowen P. Ohresser 《Journal of synchrotron radiation》2016,23(3):652-657
The design and the first experiments are described of a versatile cryogenic insert used for its electrical transport capabilities. The insert is designed for the cryomagnet installed on the DEIMOS beamline at the SOLEIL synchrotron dedicated to magnetic characterizations through X‐ray absorption spectroscopy (XAS) measurements. This development was spurred by the multifunctional properties of novel materials such as multiferroics, in which, for example, the magnetic and electrical orders are intertwined and may be probed using XAS. The insert thus enables XAS to in situ probe this interplay. The implementation of redundant wiring and careful shielding also enables studies on operating electronic devices. Measurements on magnetic tunnel junctions illustrate the potential of the equipment toward XAS studies of in operando electronic devices. 相似文献
55.
Arno Tuchbreiter Jürgen Marquardt Bernd Kappler Josef Honerkamp Marc O. Kristen Rolf Mülhaupt 《Macromolecular rapid communications》2003,24(1):47-62
High‐output polymer screening (HOPS) combines automated polymerization with online reaction monitoring, rapid polymer characterization and novel fingerprint technology useful in polymer preparation as well as polymer processing and polymer additive development. Originally, HOPS was introduced to develop polymerization catalysts and polyolefin materials more effectively. In comparison to conventional high‐throughput screening, focusing on ultrahigh speed of catalyst screening using arrays of miniaturized reactors, output‐oriented, process‐relevant HOPS is aiming at generating and exploiting high information density (useful information/experiment). Catalyst systems for olefin polymerization are evaluated in automated workstations with multiparallel as well as semi‐ and fully automated, upgraded lab reactors. Automated polymerizations under standardized conditions afford large families of well‐characterized polymers which serve as calibration samples for data analysis. Data analysis, using multivariate calibration, is the key to basic correlations between spectroscopic information and catalyst and polymer properties as well as reaction parameters and processing conditions. IR spectroscopic fingerprints are used to measure chemical copolymer composition, density, molecular weight as well as thermal and even mechanical properties. This fingerprint technology can be applied in online quality control and facilitates transfer from lab results into pilot and production plants. Fingerprint methods are important components of rapid online analysis and can reduce the need for time‐ and money‐consuming polymer testing.