scholarly journals The structural study on Fe-pumpellyite. An application of Weissenberg technique combined with a synchrotron radiation and an imaging plate.

1999 ◽  
Vol 21 (4) ◽  
pp. 151-156
Author(s):  
Makio OHKAWA ◽  
Setsuo TAKENO ◽  
Akira YOSHIASA ◽  
Kazumasa OHSUMI
Keyword(s):  
Synchrotron Radiation ◽  
Structural Study ◽  
Imaging Plate

scholarly journals Synchrotron radiation structural study of MCM-22 and CuMCM-22

2004 ◽  
Vol 60 (a1) ◽  
pp. s203-s203
Author(s):  
G. Croce ◽  
D. Viterbo ◽  
M. Milanesio ◽  
A. Frache ◽  
L. Marchese ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Structural Study

The Debye–Scherrer camera at synchrotron sources: a revisit

2012 ◽  
Vol 20 (1) ◽  
pp. 98-104 ◽  
Author(s):  
Tine Straasø ◽  
Jacob Becker ◽  
Bo Brummerstedt Iversen ◽  
Jens Als-Nielsen
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Powder Diffraction ◽  
Background Level ◽  
Cylindrical Sample ◽  
Entrance Window ◽  
Imaging Plate ◽  
High Resolution Imaging ◽  
Resolution Imaging ◽  
Imaging Plate Detector

In a powder diffraction pattern one measures the intensity of Miller-indexed Bragg peaksversusthe wavevector transfer sinθ/λ. With increasing wavevector transfer the density of occurrence of Bragg peaks increases while their intensity decreases until they vanish into the background level. The lowest possible background level is that due to Compton scattering from the powder. A powder diffraction instrument has been designed and tested that yields this ideal low-background level, obtainable by having the space between sample and detector all in vacuum with the entrance window so far upstream that scattering from it is negligible. To minimize overlap of Bragg peaks the combination of fine collimation of synchrotron radiation, a thin cylindrical sample and a high-resolution imaging plate detector is taken advantage of.

Structural study of (Nd1.85, Ce0.15)CuO4 superconducting singlecrystal by x-ray synchrotron radiation diffraction

1991 ◽  
Vol 185-189 ◽  
pp. 543-544 ◽  
Author(s):  
P. Bordet ◽  
J.L. Hodeau ◽  
M. Marezio ◽  
D.B. McWhan ◽  
R.J. Melville ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Structural Study ◽  
X Ray ◽  
Synchrotron Radiation Diffraction

X-Ray Structural Study of Li3N at High Pressure

1997 ◽  
Vol 499 ◽  
Author(s):  
Allen C. Ho ◽  
Maurice K. Granger ◽  
Arthur L. Ruoff
Keyword(s):  
High Pressure ◽  
Free Energy ◽  
Synchrotron Radiation ◽  
Equation Of State ◽  
Ambient Temperature ◽  
Structural Study ◽  
Ambient Pressure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gibb’S Free Energy

ABSTRACTThe equation of state (EOS) of Li3N has been determined by energy-dispersive x-ray diffraction (EDXD) using synchrotron radiation up to 35 GPa at ambient temperature. Both the hexagonal D6h4(P63/mmc) and the hexagonal D6h1(P6/mmm) phases were present at ambient pressure. The D6h1 -structure completely transforms into the D6h4 -structure at modest pressure. The change in Gibb's free energy as a function of pressure for Li3N was calculated using the experimental EOS.

Direct Observation of Diffraction Arcs from Nanoscale Precipitates in Steels by Highly Brilliant and Focused Synchrotron Radiation Beam and Imaging Plate

1994 ◽  
Vol 332 ◽  
Author(s):  
Yasuo Takagi ◽  
Yoshitaka Okitsu ◽  
Toshiyasu Ukena
Keyword(s):  
Synchrotron Radiation ◽  
Direct Observation ◽  
Dynamic Range ◽  
High Sensitivity ◽  
Imaging Plate ◽  
Synchrotron Radiation Beam ◽  
Radiation Beam ◽  
X Ray ◽  
The Matrix ◽  
First Time

ABSTRACTDirect observation of diffraction arcs by X-ray from nanoscale precipitates in steels has become possible for the first time by using a highly brilliant and focused synchrotron radiation beam at BL3A of Photon Factory, and also by using an “imaging plate”, a two dimensional X-ray detector which has a wide dynamic range and high sensitivity. For examples, most of the diffraction arcs from ε-Cu precipitates (∼200 Å in diameter and ∼1 at. % in concentration) in Cu-added steels were observed. The method can apply to nondestructive and in-situ observation of creation and growth processes of the precipitates which has close relationships to various physical properties of the matrix steels.

In Situ Observation of Weld Solidification and Phase Transformation Process Using Synchrotron Radiation

2007 ◽  
Vol 539-543 ◽  
pp. 3820-3825 ◽  
Author(s):  
Yuichi Komizo ◽  
Hidenori Terasaki ◽  
Mitsuharu Yonemura ◽  
Takahiro Osuki
Keyword(s):  
Phase Transformation ◽  
Synchrotron Radiation ◽  
Welding Process ◽  
Fusion Welding ◽  
Morphological Observation ◽  
Observation System ◽  
Imaging Plate ◽  
In Situ Observation ◽  
Welding Processes

In order to understand the microstructure changes during welding processes , kinetic information about the phase transformation is essential. In our research group, in-situ observation systems consisting of undulator beam and imaging plate and two dimensional pixel detector have recently been used. These make it possible that phase transformation can be identified in real-time under the condition of directional-oriented solidification . In the present work, a combination of analyzing method: the in-situ observation system by X-ray diffraction technique using intense synchrotron radiation, and morphological observation by high-temperature laser scanning confocal microscopy is suggested to analyze the phase transformation during the welding process. Using the results acquired by these analysis methods, phase evolution of hypereutectoid carbon steel, during fusion welding was analyzed. The primary phase was directly identified as an austenite phase. Precipitation of pearlite phase was observed followed by the martensitic transformation.

A high-temperature furnace for X-ray diffraction with directly machined α-Al2O3ceramic parts

1999 ◽  
Vol 32 (4) ◽  
pp. 833-836 ◽  
Author(s):  
Michael Estermann ◽  
Hans Reifler ◽  
Walter Steurer ◽  
Frank Filser ◽  
Peter Kocher ◽  
...  
Keyword(s):  
High Temperature ◽  
Synchrotron Radiation ◽  
Ceramic Materials ◽  
Imaging Plate ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Temperature Furnace ◽  
Sintering Shrinkage ◽  
Imaging Plate Detector ◽  
Temperature Furnace

A complex high-temperature furnace has been produced from presintered α-Al2O3precompacts. The furnace is designed for the Mar345 imaging-plate detector system. Up to now, the design complexity of ceramic parts has been limited by the difficulty of machining hard ceramic materials or by the moulds used in hot-pressing and casting. However, the machining of soft presintered ceramic materials enables the realisation of much more demanding designs, provided that the final sintering shrinkage of the ceramic is homogeneous and predictable. The design of the furnace and its realisation and application in an X-ray diffraction study with synchrotron radiation are presented.

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