Energy Dispersive Diffraction in a Diamond Anvil High Pressure Cell Using Synchrotron and Conventional X-Radiation

1983 ◽  
Vol 27 ◽  
pp. 331-337
Author(s):  
David R. Black ◽  
Carmen S. Menoni ◽  
Ian L. Spain
Keyword(s):  
High Pressure ◽  
Energy Dispersive ◽  
X Rays ◽  
High Pressure Cell ◽  
X Ray ◽  
Detection Techniques ◽  
Wide Range ◽  
Diamond Anvil ◽  
Experimental Geometry ◽  
Energy Dispersive Diffraction

A wide range of structural studies have been carried out in high pressure diamond anvil cells using x-rays. The most common experimental geometry is shown in Fig. 1a. The incident x-ray beam passes axially through the first diamond and enters the sample, typically 100-300 μm in diameter and 20-100 μm thick; the diffracted x-rays exit via the second diamond. Energy-dispersive detection techniques (EDXRD) have been used. However the intensity of diffracted radiation from the sample is weak, so that typical exposure times with a conventional, fixed anode, x-ray source are typically one to several days.Accordingly, higher intensity radiation from synchrotron sources has been used for these experiments.

High hydrostatic pressure small-angle X-ray scattering cell for protein solution studies featuring diamond windows and disposable sample cells

2008 ◽  
Vol 41 (1) ◽  
pp. 167-175 ◽  
Author(s):  
Nozomi Ando ◽  
Pascale Chenevier ◽  
Martin Novak ◽  
Mark W. Tate ◽  
Sol M. Gruner
Keyword(s):  
High Pressure ◽  
Small Angle ◽  
Ambient Pressure ◽  
X Rays ◽  
High Pressure Cell ◽  
X Ray ◽  
Pressure Cell ◽  
X Ray Scattering ◽  
Solution Studies ◽  
Ray Scattering

A high-pressure cell for synchrotron small-angle X-ray scattering (SAXS) studies of protein solutions is described. The design was optimized for use at up to 400 MPa in liquid pressure and with 8−12 keV X-rays with particular emphasis on the ease of use. The high-pressure cell was fabricated from corrosion-resistant Inconel 725 (Special Metals Corporation, Huntington, WV, USA) and featured Poulter-type windows [Poulter (1932).Phys. Rev.40, 861–871]. Flat natural diamonds, 500 µm thick, were recycled from diamond anvil cells and were shown to perform well as high-pressure SAXS windows. For a simple and effective method of sample isolation, disposable plastic sample cells with a defined path length and reproducible parasitic scattering were designed. These sample cells enable efficient use of synchrotron time. The cells facilitate rapid and easy sample changes, eliminate the need to clean the cell between sample changes, and reduce the sample volume to as low as 12 µl. The disposable cells can also be used separately from the high-pressure cell for SAXS measurements at ambient pressure and temporary storage of samples. The performance of the apparatus is demonstrated with T4 lysozyme.

scholarly journals High Pressure Diffraction for the Geosciences at the Advanced Light Source

2014 ◽  
Vol 70 (a1) ◽  
pp. C1097-C1097
Author(s):  
Christine Beavers ◽  
Jason Knight ◽  
Bora Kalkan ◽  
Jinyuan Yan ◽  
Alastair MacDowell ◽  
...  
Keyword(s):  
High Pressure ◽  
Light Source ◽  
High Pressures ◽  
X Rays ◽  
X Ray Diffraction ◽  
User Friendliness ◽  
X Ray ◽  
Advanced Light Source ◽  
Diamond Anvil ◽  
Multiple Detectors

The Advanced Light Source, in concert with COMPRES, supports a superconducting bending magnet beamline devoted to extreme conditions diffraction. This facility, beamline 12.2.2, is aimed at the geoscience community, but is available to any who desire high pressures, high temperatures and hard X-rays. The latest development has been integrating single crystal x-ray diffraction for diamond anvil cells into the existing suite of high pressure powder diffraction and amorphous scattering techniques. Multiple heating techniques are available to the user, as well as multiple detectors, which can be chosen to best suit the sample. The current staff are dedicated to improving the user friendliness of the beamline; a difficult experiment need not to be further complicated by a difficult beamline. Beamline infrastructure, including recent advances and improvements, will be discussed.

X-ray study of the orientational order of a concentrated dispersion of kaolinite under flow

2001 ◽  
Vol 34 (5) ◽  
pp. 573-579 ◽  
Author(s):  
Simona Barè ◽  
Jeremy K. Cockcroft ◽  
Sally L. Colston ◽  
Andrew C. Jupe ◽  
Adrian R. Rennie
Keyword(s):  
Orientational Order ◽  
High Energy ◽  
Energy Dispersive ◽  
X Rays ◽  
Rectangular Section ◽  
X Ray ◽  
Tomographic Technique ◽  
Concentrated Dispersion ◽  
Energy Dispersive Diffraction

Diffraction with high-energy X-rays is used to determine the orientational alignment of kaolinite particles dispersed in water as they flow down a pipe. Angle-dispersive and energy-dispersive diffraction methods are compared. Detailed studies of samples as thick as 1 cm were possible using energy-dispersive diffraction. A tomographic technique with the sample scanned and rotated in the beam allows maps of the alignment to be determined. The alignment across a pipe of rectangular section was determined. A strong effect caused by the walls was observed, the plate-like particles tending to lie parallel to the wall near the boundary of the pipe.

High-Pressure Cell for the Study of In-Situ Hydrates Using Energy-Dispersive X-ray Diffraction

1996 ◽  
Vol 3 (5) ◽  
pp. 220-224 ◽  
Author(s):  
C. C. Tang ◽  
C. A. Koh ◽  
A. A. Neild ◽  
R. J. Cernik ◽  
R. E. Motie ◽  
...  
Keyword(s):  
High Pressure ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
High Pressure Cell ◽  
X Ray ◽  
Pressure Cell
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