Mesoscale structural characterization within bulk materials by high-energy X-ray microdiffraction

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 919-923
Author(s):  
U. Lienert ◽  
H. F. Poulsen ◽  
A. Kvick
Keyword(s):  
Structural Characterization ◽  
High Energy ◽  
Bulk Materials ◽  
X Ray

Mesoscale Structural Characterization Within Bulk Materials by High-Energy X-Ray Microdiffraction

AIAA Journal ◽  
2001 ◽  
Vol 39 (5) ◽  
pp. 919-923 ◽  
Author(s):  
U. Lienert ◽  
H. F. Poulsen ◽  
A. Kvick
Keyword(s):  
Structural Characterization ◽  
High Energy ◽  
Bulk Materials ◽  
X Ray

scholarly journals Mechanosynthesis of the Whole Y1−xBixMn1−xFexO3 Perovskite System: Structural Characterization and Study of Phase Transitions

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1515 ◽  
Author(s):  
Jose Ángel Quintana-Cilleruelo ◽  
Vignaswaran K. Veerapandiyan ◽  
Marco Deluca ◽  
Miguel Algueró ◽  
Alicia Castro
Keyword(s):  
Phase Transitions ◽  
Structural Characterization ◽  
Perovskite Phase ◽  
Ambient Pressure ◽  
Structural Evolution ◽  
High Energy ◽  
Planetary Mill ◽  
Nanocrystalline Powders ◽  
X Ray ◽  
Gradual Evolution

Perovskite BiFeO3 and YMnO3 are both multiferroic materials with distinctive magnetoelectric coupling phenomena. Owing to this, the Y1−xBix Mn1−xFexO3 solid solution seems to be a promising system, though poorly studied. This is due to the metastable nature of the orthorhombic perovskite phase of YMnO3 at ambient pressure, and to the complexity of obtaining pure rhombohedral phases for BiFeO3-rich compositions. In this work, nanocrystalline powders across the whole perovskite system were prepared for the first time by mechanosynthesis in a high-energy planetary mill, avoiding high pressure and temperature routes. Thermal decomposition temperatures were determined, and structural characterization was carried out by X-ray powder diffraction and Raman spectroscopy on thermally treated samples of enhanced crystallinity. Two polymorphic phases with orthorhombic Pnma and rhombohedral R3c h symmetries, and their coexistence over a wide compositional range were found. A gradual evolution of the lattice parameters with the composition was revealed for both phases, which suggests the existence of two continuous solid solutions. Following bibliographic data for BiFeO3, first order ferroic phase transitions were located by differential thermal analysis in compositions with x ≥ 0.9. Furthermore, an orthorhombic-rhombohedral structural evolution across the ferroelectric transition was characterized with temperature-dependent X-ray diffraction.

scholarly journals Local Structural Characterization within Polycrystalline Bulk Materials by High Energy Synchrotron Radiation

2000 ◽  
Vol 56 (s1) ◽  
pp. s51-s51
Author(s):  
U. Lienert ◽  
H. F. Poulsen ◽  
D. Juul Jensen ◽  
E. M. Lauridsen ◽  
S. F. Nielsen ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Structural Characterization ◽  
High Energy ◽  
Bulk Materials

scholarly journals High energy resolution core-level X-ray spectroscopy for electronic and structural characterization of osmium compounds

2013 ◽  
Vol 15 (38) ◽  
pp. 16152 ◽  
Author(s):  
Kirill A. Lomachenko ◽  
Claudio Garino ◽  
Erik Gallo ◽  
Diego Gianolio ◽  
Roberto Gobetto ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Structural Characterization ◽  
High Energy ◽  
Core Level ◽  
High Energy Resolution ◽  
X Ray

Plastic Deformation and Recrystallization Studied by the 3-D x-ray Microscope

1999 ◽  
Vol 590 ◽  
Author(s):  
D. Juul Jensen ◽  
Å. Kvick ◽  
E.M. Lauridsen ◽  
U. Lienert ◽  
L. Margulies ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Structural Characterization ◽  
Materials Science ◽  
Thermomechanical Processing ◽  
Bulk Materials ◽  
X Ray ◽  
First Results

ABSTRACTA newly developed synchrotron instrument – the so-called 3D X-ray microscope – is presented. The instrument is placed at the Materials Science beamline at ESRF and dedicated to local μm scale structural characterization within bulk materials. In this paper, emphasis is on in situ studies of thermomechanical processing. The potential of the instrument for characterization of single nuclei and grains is described and discussed based on both first results and planned experiments.

High-purity Ge x-ray detectors: Sensitivity factors and usefulness

1990 ◽  
Vol 48 (2) ◽  
pp. 548-548
Author(s):  
E. B. Steel
Keyword(s):  
High Purity ◽  
High Energy ◽  
Quantitative Chemical Analysis ◽  
Detector Performance ◽  
X Ray ◽  
Detector Sensitivity ◽  
Specimen Holder ◽  
Many Instruments ◽  
Charge Resolution ◽  
Sensitivity Factors

High Purity Germanium (HPGe) x-ray detectors are now commercially available for the analytical electron microscope (AEM). The detectors have superior efficiency at high x-ray energies and superior resolution compared to traditional lithium-drifted silicon [Si(Li)] detectors. However, just as for the Si(Li), the use of the HPGe detectors requires the determination of sensitivity factors for the quantitative chemical analysis of specimens in the AEM. Detector performance, including incomplete charge, resolution, and durability has been compared to a first generation detector. Sensitivity factors for many elements with atomic numbers 10 through 92 have been determined at 100, 200, and 300 keV. This data is compared to Si(Li) detector sensitivity factors.The overall sensitivity and utility of high energy K-lines are reviewed and discussed. Many instruments have one or more high energy K-line backgrounds that will affect specific analytes. One detector-instrument-specimen holder combination had a consistent Pb K-line background while another had a W K-line background.

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