Methods and application of the Paris–Edinburgh Press to X-ray diffraction structure solution with large-volume samples at high pressures and temperatures

2005 ◽  
pp. 353-369 ◽  
Author(s):  
Wilson A. Crichton ◽  
Mohamed Mezouar
Keyword(s):  
Large Volume ◽  
High Pressures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Solution ◽  
Diffraction Structure ◽  
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

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.

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.

Thermal expansion, compressibility and bulk modulus of ilmenite-type CoTiO3: X-ray diffraction at high pressures and temperatures

2019 ◽  
Vol 88 ◽  
pp. 1-5 ◽  
Author(s):  
T.R. Cunha ◽  
A.D. Rodrigues ◽  
J.E. Rodrigues ◽  
D.V. Sampaio ◽  
B.J.A. Moulton ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Bulk Modulus ◽  
High Pressures ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressures And Temperatures

scholarly journals Nitrosonium nitrate (NO+NO3 −) structure solution using in situ single-crystal X-ray diffraction in a diamond anvil cell

IUCrJ ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 208-214
Author(s):  
Dominique Laniel ◽  
Bjoern Winkler ◽  
Egor Koemets ◽  
Timofey Fedotenko ◽  
Stella Chariton ◽  
...  
Keyword(s):  
Single Crystal ◽  
Density Functional ◽  
High Pressures ◽  
Density Functional Theory Calculations ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molecular Systems ◽  
Structure Solution ◽  
Diamond Anvil

At high pressures, autoionization – along with polymerization and metallization – is one of the responses of simple molecular systems to a rise in electron density. Nitrosonium nitrate (NO+NO3 −), known for this property, has attracted a large interest in recent decades and was reported to be synthesized at high pressure and high temperature from a variety of nitrogen–oxygen precursors, such as N2O4, N2O and N2–O2 mixtures. However, its structure has not been determined unambiguously. Here, we present the first structure solution and refinement for nitrosonium nitrate on the basis of single-crystal X-ray diffraction at 7.0 and 37.0 GPa. The structure model (P21/m space group) contains the triple-bonded NO+ cation and the NO3 − sp 2-trigonal planar anion. Remarkably, crystal-chemical considerations and accompanying density-functional-theory calculations show that the oxygen atom of the NO+ unit is positively charged – a rare occurrence when in the presence of a less-electronegative element.

scholarly journals The thermal equation of state of FeTiO3 ilmenite based on in situ X-ray diffraction at high pressures and temperatures

2010 ◽  
Vol 95 (11-12) ◽  
pp. 1708-1716 ◽  
Author(s):  
E. J. Tronche ◽  
M. van Kan Parker ◽  
J. de Vries ◽  
Y. Wang ◽  
T. Sanehira ◽  
...  
Keyword(s):  
Equation Of State ◽  
High Pressures ◽  
X Ray Diffraction ◽  
Thermal Equation ◽  
X Ray ◽  
Thermal Equation Of State ◽  
High Pressures And Temperatures
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