Double-Stage Multi-Anvil System with a Sintered Diamond Anvil for X-Ray Diffraction Experiment at High Pressures and Temperatures

2013 ◽  
pp. 33-36 ◽  
Author(s):  
Takumi Kato ◽  
Eiji Ohtani ◽  
Noriko Kamaya ◽  
Osamu Shimomura ◽  
Takumi Kikegawa
Keyword(s):  
High Pressures ◽  
Diffraction Experiment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diamond Anvil ◽  
Sintered Diamond ◽  
High Pressures And Temperatures

Two-dimensional energy dispersive x-ray diffraction at high pressures and temperatures

2001 ◽  
Vol 72 (2) ◽  
pp. 1302 ◽  
Author(s):  
Yanzhang Ma ◽  
Ho-kwang Mao ◽  
Russell J. Hemley ◽  
Stephen A. Gramsch ◽  
Guoyin Shen ◽  
...  
Keyword(s):  
High Pressures ◽  
Energy Dispersive ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressures And Temperatures

scholarly journals Synthesis of clathrate cerium superhydride CeH9 at 80-100 GPa with atomic hydrogen sublattice

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Nilesh P. Salke ◽  
M. Mahdi Davari Esfahani ◽  
Youjun Zhang ◽  
Ivan A. Kruglov ◽  
Jianshi Zhou ◽  
...  
Keyword(s):  
Atomic Hydrogen ◽  
High Pressures ◽  
Structure Stability ◽  
X Ray Diffraction ◽  
Detailed Chemistry ◽  
X Ray ◽  
3 Dimensional ◽  
Diamond Anvil ◽  
Laser Heated ◽  
Very High

Abstract Hydrogen-rich superhydrides are believed to be very promising high-Tc superconductors. Recent experiments discovered superhydrides at very high pressures, e.g. FeH5 at 130 GPa and LaH10 at 170 GPa. With the motivation of discovering new hydrogen-rich high-Tc superconductors at lowest possible pressure, here we report the prediction and experimental synthesis of cerium superhydride CeH9 at 80–100 GPa in the laser-heated diamond anvil cell coupled with synchrotron X-ray diffraction. Ab initio calculations were carried out to evaluate the detailed chemistry of the Ce-H system and to understand the structure, stability and superconductivity of CeH9. CeH9 crystallizes in a P63/mmc clathrate structure with a very dense 3-dimensional atomic hydrogen sublattice at 100 GPa. These findings shed a significant light on the search for superhydrides in close similarity with atomic hydrogen within a feasible pressure range. Discovery of superhydride CeH9 provides a practical platform to further investigate and understand conventional superconductivity in hydrogen rich superhydrides.

Structural stability of WS2 under high pressure

2014 ◽  
Vol 28 (25) ◽  
pp. 1450168 ◽  
Author(s):  
Nirup Bandaru ◽  
Ravhi S. Kumar ◽  
Jason Baker ◽  
Oliver Tschauner ◽  
Thomas Hartmann ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Structural Changes ◽  
High Pressures ◽  
Structural Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diamond Anvil ◽  
Heating Up

Structural behavior of bulk WS 2 under high pressure was investigated using synchrotron X-ray diffraction and diamond anvil cell up to 52 GPa along with high temperature X-ray diffraction and high pressure Raman spectroscopy analysis. The high pressure results obtained from X-ray diffraction and Raman analysis did not show any pressure induced structural phase transformations up to 52 GPa. The high temperature results show that the WS 2 crystal structure is stable upon heating up to 600°C. Furthermore, the powder X-ray diffraction obtained on shock subjected WS 2 to high pressures up to 10 GPa also did not reveal any structural changes. Our results suggest that even though WS 2 is less compressible than the isostructural MoS 2, its crystal structure is stable under static and dynamic compressions up to the experimental limit.

Transformation from molecular to polymeric nitrogen at high pressures and temperatures: In situ x-ray diffraction study

2008 ◽  
Vol 93 (9) ◽  
pp. 091907 ◽  
Author(s):  
I. A. Trojan ◽  
M. I. Eremets ◽  
S. A. Medvedev ◽  
A. G. Gavriliuk ◽  
V. B. Prakapenka
Keyword(s):  
Diffraction Study ◽  
High Pressures ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressures And Temperatures ◽  
Polymeric Nitrogen

Synthesis of carbon nitride crystals at high pressures and temperatures

1998 ◽  
Vol 13 (12) ◽  
pp. 3458-3462 ◽  
Author(s):  
D. W. He ◽  
F. X. Zhang ◽  
X. Y. Zhang ◽  
Z. C. Qin ◽  
M. Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carbon Nitride ◽  
High Pressures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lattice Constants ◽  
Nickel Based Alloy ◽  
High Pressures And Temperatures ◽  
Scanning Electron

Carbon nitride crystals have been synthesized from C3N4H4 in the presence of a nickel-based alloy or cobalt as a catalyst at high pressure of 7 GPa and temperature of about 1400 °C. Scanning electron microscopy showed rod-like, well-faceted crystals with size of several micrometers, and the N content in these carbon nitride crystals was 47–62%. X-ray diffraction indicated the crystals were composed of α–C3N4 and β–C3N4. The experimental lattice constants of α–C3N4 (a = 6.425 Å, c = 4.715 Å ) and β–C3N4 (a = 6.419 Å, c = 2.425 Å ) agree with ab initio calculations very well.

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.

Oxygen Vacancies in Perovskite and Related Structures: Implications for the Lower Mantle

2002 ◽  
Vol 718 ◽  
Author(s):  
Catherine A. McCammon ◽  
Ana Isabel Becerro ◽  
Stefan Lauterbach ◽  
Ulrich Bläß ◽  
Stefan Marion ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Lower Mantle ◽  
Oxygen Vacancies ◽  
High Pressures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Vacancy Ordering ◽  
High Pressures And Temperatures ◽  
Electron Energy Loss

AbstractThe oxygen vacancy ordering process and displacive transitions have been characterised in the system CaTiO3-CaFeO2.5 as a function of composition and temperature at atmospheric pressure using X-ray diffraction, Mössbauer spectroscopy, infrared spectroscopy, transmission electron microscopy, electron energy loss spectroscopy, neutron diffraction and electrical conductivity methods. With increasing concentration of vacancies the following sequence is observed: isolated defects → short defect chains → infinite chains in layers. Similar experiments at high pressures and temperatures have been conducted to determine the nature of oxygen vacancies in the lower mantle phases (Mg,Fe)(Si,Al)O3-σ and Ca(Si,Fe)O3-σ perovskite.

Sign in / Sign up

Export Citation Format

Share Document