Performance of tapered anvils in a DIA-type, cubic-anvil, high-pressure apparatus for X ray diffraction studies

1998 ◽  
pp. 35-39 ◽  
Author(s):  
Yanbin Wang ◽  
Ivan C. Getting ◽  
Donald J. Weidner ◽  
Michael T. Vaughan
Keyword(s):  
High Pressure ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure Apparatus

Formation of two crystal modifications of Fe7C3−x at 5.5 GPa

2019 ◽  
Vol 52 (6) ◽  
pp. 1378-1384
Author(s):  
Sergey Gromilov ◽  
Anatoly Chepurov ◽  
Valeri Sonin ◽  
Egor Zhimulev ◽  
Aleksandr Sukhikh ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressures ◽  
Experimental Studies ◽  
X Ray Diffraction ◽  
High Iron Content ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Micro Analysis ◽  
Crystal Modifications ◽  
High Pressure Apparatus

The Fe–C system, which is widely used to grow commercial high-pressure–high-temperature diamond monocrystals, is rather complicated due to the formation of carbides. The carbide Fe3C is a normal run product, but the pressure at which Fe7C3 carbide becomes stable is a subject of discussion. This paper demonstrates the synthesis of Fe7C3 carbide and its detailed study using single-crystal and powder X-ray diffraction, as well as electron probe micro-analysis and scanning electron microscopy. The experiments were performed using a multiple-anvil high-pressure apparatus of `split-sphere' (BARS) type at a pressure of 5.5 GPa and a temperature of 1623 K. Our results show that in the Fe–C system, in addition to diamond, a phase that corresponds to the Fe7C3 carbide was synthesized. This means that both carbides (Fe7C3 and Fe3C) are stable at 5.5 GPa. Two crystal phases are described, Fe14C6 and Fe28C12−x . Fe14C6 is based on the well known rhombic structure of Fe7C3, while Fe28C12−x has a different packing order of Fe6C polyhedrons. The results obtained in this study should be taken into account when synthesizing and growing diamond at high pressures and temperatures in metal–carbon systems with a high iron content, as well as when conducting experimental studies on the synthesis of diamond directly from carbide.

scholarly journals P-V-Trelations of wadsleyite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus

2009 ◽  
Vol 36 (11) ◽  
Author(s):  
Tomoo Katsura ◽  
Anton Shatskiy ◽  
M. A. Geeth M. Manthilake ◽  
Shuangmeng Zhai ◽  
Daisuke Yamazaki ◽  
...  
Keyword(s):  
High Pressure ◽  
Large Volume ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure Apparatus

scholarly journals Correction to “P-V-T relations of the MgSiO3perovskite determined by in situ X-ray diffraction using a large-volume high-pressure apparatus”

2009 ◽  
Vol 36 (16) ◽  
Author(s):  
Tomoo Katsura ◽  
Sho Yokoshi ◽  
Kazuaki Kawabe ◽  
Anton Shatskiy ◽  
M. A. Geeth M. Manthilake ◽  
...  
Keyword(s):  
High Pressure ◽  
Large Volume ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure Apparatus

scholarly journals P-V-T relations of MgSiO3perovskite determined by in situ X-ray diffraction using a large-volume high-pressure apparatus

2009 ◽  
Vol 36 (1) ◽  
Author(s):  
Tomoo Katsura ◽  
Sho Yokoshi ◽  
Kazuaki Kawabe ◽  
Anton Shatskiy ◽  
M. A. Geeth M. Manthilake ◽  
...  
Keyword(s):  
High Pressure ◽  
Large Volume ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure Apparatus

P-V-T relations of  -Ca3(PO4)2 tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus

2013 ◽  
Vol 98 (10) ◽  
pp. 1811-1816 ◽  
Author(s):  
S. Zhai ◽  
D. Yamazaki ◽  
W. Xue ◽  
L. Ye ◽  
C. Xu ◽  
...  
Keyword(s):  
High Pressure ◽  
Large Volume ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure Apparatus

Effect of high pressure-temperature on silicon layered structures as determined by X-ray diffraction and electron microscopy

2004 ◽  
Vol 27 (1-3) ◽  
pp. 415-418
Author(s):  
J. Bak-Misiuk ◽  
A. Misiuk ◽  
J. Ratajczak ◽  
A. Shalimov ◽  
I. Antonova ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Layered Structures ◽  
X Ray Diffraction ◽  
X Ray

Revisiting the High-Pressure Properties of the Metal-Organic Frameworks ZIF-8 and ZIF-67

2020 ◽  
Author(s):  
Pia Vervoorts ◽  
Stefan Burger ◽  
Karina Hemmer ◽  
Gregor Kieslich
Keyword(s):  
High Pressure ◽  
State Of The Art ◽  
Energy Landscape ◽  
Structural Flexibility ◽  
Zeolitic Imidazolate Frameworks ◽  
Stimuli Responsive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Open Questions ◽  
Metal Organic

The zeolitic imidazolate frameworks ZIF-8 and ZIF-67 harbour a series of fascinating stimuli responsive properties. Looking at their responsitivity to hydrostatic pressure as stimulus, open questions exist regarding the isotropic compression with non-penetrating pressure transmitting media. By applying a state-of-the-art high-pressure powder X-ray diffraction setup, we revisit the high-pressure behaviour of ZIF-8 and ZIF-67 up to <i>p</i> = 0.4 GPa in small pressure increments. We observe a drastic, reversible change of high-pressure powder X-ray diffraction data at <i>p</i> = 0.3 GPa, discovering large volume structural flexibility in ZIF-8 and ZIF-67. Our results imply a shallow underlying energy landscape in ZIF-8 and ZIF-67, an observation that might point at rich polymorphism of ZIF-8 and ZIF-67, similar to ZIF-4(Zn).<br>

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