Low-Temperature Synchrotron Radiation Study of a Twinned Disordered Crystal of Bis(4,4'-bromophenyl)-61,61-diyl Methano Fullerene C60

1998 ◽  
Vol 54 (2) ◽  
pp. 174-179 ◽  
Author(s):  
B. B. Iversen ◽  
A. Darovsky ◽  
R. Bolotovsky ◽  
P. Coppens
Keyword(s):  
Synchrotron Radiation ◽  
Low Temperature ◽  
Satisfactory Description ◽  
Area Detector ◽  
Chemical Crystallography ◽  
Synchrotron Radiation Diffraction ◽  
Radiation Technique ◽  
Indispensable Tool ◽  
Disordered Crystal

Synchrotron radiation diffraction measurements at 100 (5) K have been carried out on bis(4,4′-bromophenyl)-61,61-diyl methano fullerene C60 using area detector technology. In order to obtain a satisfactory description of the data it is necessary to introduce both a twinning model of the crystal and a disorder model consisting of two different isomers of the title compound. The study provides the first solid-state characterization of a 6–5 isomer of a methano fullerene. For the 6–6 isomer the geometry is in good agreement with recent literature on methano fullerenes. Unfortunately, the present study cannot resolve the bond lengths in the transannular region. The fact that the structure can be solved from diffraction data measured on a minute poorly scattering crystal shows that the low-temperature single-crystal synchrotron radiation technique is an indispensable tool in chemical crystallography.

Structure Characterisation of Electrodeposited Ni-Co Alloy

2014 ◽  
Vol 782 ◽  
pp. 603-606 ◽  
Author(s):  
Ondrej Milkovič ◽  
Karel Saksl ◽  
Mária Hagarová ◽  
Štefan Michalik ◽  
Jana Gamcová
Keyword(s):  
Electron Microscope ◽  
Chemical Composition ◽  
Synchrotron Radiation ◽  
Copper Surface ◽  
Structure Characterization ◽  
Synchrotron Radiation Diffraction ◽  
Diffraction Patterns ◽  
Co Alloys ◽  
Scanning Electron

This paper is focused to structure characterization of two differently electrodeposited Ni-Co alloys on the copper surface. The chemical composition of the layers was determined by the EDX analysis in the scanning electron microscope. Phase analysis was realized by diffraction in the transmission mode using synchrotron radiation. Diffraction patterns also show the preferred orientation in the coating with saccharine addition.

Analysis of Spherical Carbides Formed in Chromium Added Hypereutectoid Bearing Steels

2007 ◽  
Vol 539-543 ◽  
pp. 4866-4871 ◽  
Author(s):  
Atsushi Yamamoto ◽  
Katsuhiko Inoue ◽  
Harushige Tsubakino
Keyword(s):  
Electron Microscope ◽  
Synchrotron Radiation ◽  
Low Temperature ◽  
Transmission Electron Microscope ◽  
Bearing Steel ◽  
Bearing Steels ◽  
Transmission Electron ◽  
Synchrotron Radiation Diffraction ◽  
M23c6 Type ◽  
Means Of Transmission

Microstructures in a bearing steel, JIS SUJ2, have been observed and analyzed in detail by means of transmission electron microscope and synchrotron radiation diffraction in SPring-8. Spherodized carbides in the steel are generally recognized as spherical cementite particles, but some of them have been clearly shown to be M23C6 type of carbide in this study. The shapes and sizes of these two types of carbides are similar to each other. On the martensitic matrix of the steel, it is believed to be stable at relatively low temperature, but it is also shown to be decomposed to form cementite by prolonged aging at 383 K, which provides a reason for decrease in hardness in standard hardness blocks, previously reported by the authors.

Advanced Microstructural Characterizations of Some Biomaterials and Scaffolds for Regenerative Orthopaedics

2017 ◽  
Vol 745 ◽  
pp. 3-15
Author(s):  
Fabrizio Fiori ◽  
Emmanuelle Girardin ◽  
Vladimir S. Komlev ◽  
Adrian Manescu ◽  
Franco Rustichelli
Keyword(s):  
Electron Microscopy ◽  
Synchrotron Radiation ◽  
Experimental Methods ◽  
Bone Defects ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synchrotron Radiation Diffraction ◽  
Regeneration Of Bone ◽  
Standard Techniques

In the last decades, very significant advances have been made for what concerns bone and joint substitution and in the repair and regeneration of bone defects. Though some strong requirements are still to be met, biomaterials for these purposes have known an impressive evolution, for what concerns their mechanical behaviour, their bioresorbability and finally their capability to generate new bone tissue in a stable way in long periods. The validation of such materials necessarily depends on a suitable characterization of their properties. In this article a brief review of some works in this field, carried out by the authors’ research group, is presented. It was shown in particular how advanced experimental methods, such as synchrotron radiation µCT and synchrotron radiation diffraction can offer very important information, can be not only complementary methods to more standard techniques (electron microscopy, X-ray diffraction), but can also offer the possibility to measure parameters that cannot be obtained otherwise.

Characterization of Low Temperature SiNx Films for 3D/2.5D-IC TSV

2015 ◽  
Vol 135 (7) ◽  
pp. 733-738 ◽  
Author(s):  
Yasushi Kobayashi ◽  
Yoshihiro Nakata ◽  
Tomoji Nakamura ◽  
Mayumi B. Takeyama ◽  
Masaru Sato ◽  
...  
Keyword(s):  
Low Temperature

scholarly journals Synchrotron radiation macromolecular crystallography: our science and spin offs

2014 ◽  
Vol 70 (a1) ◽  
pp. C10-C10
Author(s):  
John Helliwell
Keyword(s):  
Synchrotron Radiation ◽  
Protein Complexes ◽  
Bound Water ◽  
Water Structure ◽  
Public Understanding ◽  
Anomalous Scattering ◽  
Structural Studies ◽  
Macromolecular Crystallography ◽  
Time Resolved ◽  
Chemical Crystallography

I will give an overview of synchrotron radiation (SR) in macromolecular crystallography (MX) instrumentation, methods and applications from the early days to the present, including the evolution of SR sources and on to the `ultimate storage ring'. The build of dedicated beamlines for resonant anomalous scattering, large unit cells, ever smaller crystals and studies up to ultra-high resolution are core benefits. Results include a high output of PDB depositions, the successful use of microcrystals, pushing the frontiers of using high and low photon energies and time-resolved structural studies at even sub-nanosecond resolutions. These intensively physics based developments will be complemented by biological and chemical crystallography research results, encompassing catalysis and marine coloration, as well as the public understanding of our science and its impacts. Spin off benefits include services to the pharmaceutical industry and helping develop chemical crystallography uses of SR. The development of the Laue method with SR has led to pioneering spin off developments in neutron MX, including transfer of the well validated Daresbury Laue software to various neutron facilities worldwide. Neutron MX is gathering pace as new instrumentation and dedicated sample preparation facilities are in place at reactor and spallation neutron sources; smaller samples and much larger molecular weight protein complexes are now feasible for investigation so as to establish their protonation states and bound water structure. With the X-ray lasers, closely linked to the SR developments, we anticipate the use of ever smaller samples such as nanocrystals, nanoclusters and single molecules, as well as opening up femtosecond time-resolved diffraction structural studies. At the SR sources, a very high throughput assessment for the best crystal samples and tackling sub-micron crystals will become widespread.

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