High pressure phase transitions in organic solids II: X-ray diffraction study ofp-dichlorobenzene at high pressures

Pramana ◽  
1986 ◽  
Vol 27 (6) ◽  
pp. 835-839 ◽  
Author(s):  
Hema Sankaran ◽  
Surinder M Sharma ◽  
S K Sikka ◽  
R Chidambaram
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Diffraction Study ◽  
High Pressures ◽  
High Pressure Phase ◽  
X Ray Diffraction ◽  
Organic Solids ◽  
X Ray ◽  
Pressure Phase

High-Pressure Phase Transitions of Cubic Y 2 O 3 under High Pressures by In-situ Synchrotron X-Ray Diffraction

2019 ◽  
Vol 36 (4) ◽  
pp. 046103 ◽  
Author(s):  
Sheng Jiang ◽  
Jing Liu ◽  
Xiao-Dong Li ◽  
Yan-Chun Li ◽  
Shang-Ming He ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Pressures ◽  
High Pressure Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pressure Phase

A new high-pressure phase transition in clinoferrosilite: In situ single-crystal X-ray diffraction study

2017 ◽  
Vol 102 (3) ◽  
pp. 666-673 ◽  
Author(s):  
Anna Pakhomova ◽  
Leyla Ismailova ◽  
Elena Bykova ◽  
Maxim Bykov ◽  
Tiziana Boffa Ballaran ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Single Crystal ◽  
Diffraction Study ◽  
High Pressure Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure Phase Transition ◽  
Pressure Phase

High-pressure phase transformations in NdVO4 under hydrostatic, conditions: a structural powder x-ray diffraction study

2019 ◽  
Vol 31 (23) ◽  
pp. 235401 ◽  
Author(s):  
T Marqueño ◽  
V Monteseguro ◽  
F Cova ◽  
D Errandonea ◽  
D Santamaria-Perez ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformations ◽  
Diffraction Study ◽  
High Pressure Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural Powder ◽  
Pressure Phase

scholarly journals Laser-Based Dynamic Compression of Solids to Ultrahigh Pressures

2014 ◽  
Vol 70 (a1) ◽  
pp. C396-C396
Author(s):  
Thomas Duffy ◽  
Jue Wang ◽  
Federica Coppari ◽  
Raymond Smith ◽  
Jon Eggert ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Magnesium Oxide ◽  
Extrasolar Planets ◽  
Dynamic Compression ◽  
High Pressure Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pressure Phase ◽  
B2 Structure

Laser-based dynamic compression provides new opportunities to study the structures and properties of materials to ultrahigh pressure conditions. In this technique, high-powered laser beams are used to ablate a sample surface and by reaction a compression wave is generated and propagate through the sample. By controlling the shape and duration of the laser pulse, either shock or ramp (shockless) compression can be produced. Diagnostics include velocity interferometry (from which the stress-density response of the material can be determined) and x-ray diffraction from which structural information is obtained. Magnesium oxide is a fundamental ionic solid which has been extensively examined at high pressures. Theoretical studies predict a change in MgO from a rocksalt (B1) crystal structure to a cesium chloride (B2) structure at pressures of about 400–600 GPa but diamond anvil cell experiments have not been able to reach these pressures. Here we present dynamic X-ray diffraction measurements of ramp-compressed magnesium oxide. We show that a solid–solid phase transition, consistent with a transformation to the B2 structure occurs near 600 GPa. On further compression, this structure remains stable to 900 GPa. Our results provide an experimental benchmark to the equations of state and transition pressure of magnesium oxide, and may help constrain interior properties of super-Earth extrasolar planets. We have also examined the high-pressure behavior of molybdenum under both shock and ramp loading. The melting curves and high-pressure phase diagrams of transition metals have been controversial, and Mo is an excellent test case for resolving these discrepancies. We have conducted shock compression experiments on Mo with an X-ray diffraction diagnostic to address previous claims of high-pressure phase transitions and to determine the location of the Hugoniot melting point. We have also carried out ramp compression experiments to test predictions of phase transitions in Mo at ultrahigh pressures and low temperatures.

Image Plate X-Ray Diffraction Study of Distorted FCC Phase in Rare Earth Metals at High Pressures

1997 ◽  
Vol 499 ◽  
Author(s):  
Steven Beaver ◽  
Gary N. Chesnut ◽  
Yogesh K. Vohra
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
Diffraction Study ◽  
High Pressures ◽  
Rare Earth Metals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fcc Phase ◽  
First Time ◽  
Pressure Phase

ABSTRACTA high-pressure phase of gadolinium is completely described for the first time. This phase, HR24, is found to exist at 46 GPa. The structure is examined for evidence of delocalization of the f shell, and the evolution of the HR24 phase with increasing pressure is discussed.

Monoclinic FeO at high pressures

2008 ◽  
Vol 223 (7/2008) ◽  
Author(s):  
Innokenty Kantor ◽  
Alexander Kurnosov ◽  
Catherine McCammon ◽  
Leonid Dubrovinsky
Keyword(s):  
High Pressure ◽  
Iron Oxide ◽  
Single Crystal ◽  
Diffraction Study ◽  
High Pressures ◽  
X Ray Diffraction ◽  
X Ray

AbstractA high-pressure quasi-single crystal X-ray diffraction study of a synthetic iron oxide Fe

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