Improved model for the determination of strain fields and chemical composition of semiconductor heterostructures by high-resolution X-ray diffractometry

1996 ◽  
Vol 98 (7) ◽  
pp. 599-603 ◽  
Author(s):  
L Tapfer ◽  
L De Caro ◽  
C Giannini ◽  
H.-P Schönherr ◽  
K.H Ploog
Keyword(s):  
Chemical Composition ◽  
High Resolution ◽  
Semiconductor Heterostructures ◽  
Strain Fields ◽  
X Ray ◽  
Improved Model

scholarly journals The Voyage of Metals in the Universe from Cosmological to Planetary Scales: the need for a Very High-Resolution, High Throughput Soft X-ray Spectrometer

2021 ◽  
Author(s):  
F. Nicastro ◽  
J. Kaastra ◽  
C. Argiroffi ◽  
E. Behar ◽  
S. Bianchi ◽  
...  
Keyword(s):  
Chemical Composition ◽  
High Resolution ◽  
Deep Understanding ◽  
High Resolution Spectroscopy ◽  
X Ray ◽  
Viable Solution ◽  
Surrounding Space ◽  
Nuclear Processes ◽  
The Universe ◽  
Very High

AbstractMetals form an essential part of the Universe at all scales. Without metals we would not exist, and the Universe would look completely different. Metals are primarily produced via nuclear processes in stars, and spread out through winds or explosions, which pollute the surrounding space. The wanderings of metals in-and-out of astronomical objects are crucial in determining their own evolution and thus that of the Universe as a whole. Detecting metals and assessing their relative and absolute abundances and energetics can thus be used to trace the evolution of these cosmic components. The scope of this paper is to highlight the most important open astrophysical problems that will be central in the next decades and for which a deep understanding of the Universe’s wandering metals, their physical and kinematical states, and their chemical composition represents the only viable solution. The majority of these studies can only be efficiently performed through High Resolution Spectroscopy in the soft X-ray band.

Triosmium Clusters on a Support: Determination of Structure by X-ray Absorption Spectroscopy and High-Resolution Microscopy

2010 ◽  
Vol 17 (3) ◽  
pp. 1000-1008 ◽  
Author(s):  
Shareghe Mehraeen ◽  
Apoorva Kulkarni ◽  
Miaofang Chi ◽  
Bryan W. Reed ◽  
Norihiko L. Okamoto ◽  
...  
Keyword(s):  
High Resolution ◽  
Absorption Spectroscopy ◽  
Triosmium Clusters ◽  
X Ray ◽  
X Ray Absorption ◽  
High Resolution Microscopy

scholarly journals 3P-094 High resolution and precise X-ray crystal structure determination of Cyctochrome c Oxidase(The 46th Annual Meeting of the Biophysical Society of Japan)

2008 ◽  
Vol 48 (supplement) ◽  
pp. S142
Author(s):  
Michihiro Suga ◽  
Kyoko Ito-Shinzawa ◽  
Hiroshi Aoyama ◽  
Kazumasa Muramoto ◽  
Eiki Yamashita ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Annual Meeting ◽  
Structure Determination ◽  
Crystal Structure Determination ◽  
X Ray ◽  
Biophysical Society

scholarly journals Determination of Chromite Sands Suitability for Use in Moulding Sands

2017 ◽  
Vol 17 (2) ◽  
pp. 107-110
Author(s):  
K. Stec ◽  
J. Podwórny ◽  
B. Psiuk ◽  
Ł. Kozakiewicz
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Chemical Composition ◽  
Chemical Properties ◽  
Grinding Process ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Spectroscopy Technique ◽  
X Ray

Abstract Using the available analytical methods, including the determination of chemical composition using wavelength-dispersive X-ray fluorescent spectroscopy technique and phase composition determined using X-ray diffraction, microstructural observations in a highresolution scanning microscope equipped with an X-ray microanalysis system as well as determination of characteristic softening and sintering temperatures using high-temperature microscope, the properties of particular chromite sands were defined. For the study has been typed reference sand with chemical properties, physical and thermal, treated as standard, and the sands of the regeneration process and the grinding process. Using these kinds of sand in foundries resulted in the occurrence of the phenomenon of the molding mass sintering. Impurities were identified and causes of sintering of a moulding sand based on chromite sand were characterized. Next, research methods enabling a quick evaluation of chromite sand suitability for use in the preparation of moulding sands were selected.

An X-ray study of the crystal-structure of antigorite (With Plate V)

1945 ◽  
Vol 27 (188) ◽  
pp. 65-74 ◽  
Author(s):  
Endel Aruja
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
Line Broadening ◽  
X Ray ◽  
Complete Determination

Antigorite is a lamellar variety of serpentine, and is supposed to be a dimorphous form of chrysotile, which is finely fibrous. Its chemical composition is approximately H4Mg3Si2O9, which is taken as the basis of calculations here.This study was undertaken primarily because it was hoped that knowledge of the structure of antigorite would throw some light on that of chrysotile. Certain similarities between the two structures have been established, namely in the c(7·3kX or 14·6kX), and b(9·2kX) directions. There are two main differences, however. Firstly, imperfections which cause line broadening in the X-ray pattern of chrysotile, are absent in antigorite (apart from certain ‘streaks’). Secondly, the a(43·4kX) axis of antigorite is approximately eight times longer than the corresponding axis in chrysotile. A complete determination of the structure has not been achieved, but the X-ray pattern has been described, and some suggestions made as to the explanation of the peculiarities observed. A further study of the outstanding questions is in progress.

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