In situ Raman and X-ray diffraction studies on the high pressure and temperature stability of methane hydrate up to 55 GPa

2018 ◽  
Vol 148 (16) ◽  
pp. 164503 ◽  
Author(s):  
Hirokazu Kadobayashi ◽  
Hisako Hirai ◽  
Hiroaki Ohfuji ◽  
Michika Ohtake ◽  
Yoshitaka Yamamoto
Keyword(s):  
High Pressure ◽  
Methane Hydrate ◽  
Temperature Stability ◽  
X Ray Diffraction ◽  
High Pressure And Temperature ◽  
X Ray ◽  
In Situ Raman

scholarly journals The Viscosity and Atomic Structure of Volatile-Bearing Melilititic Melts at High Pressure and Temperature and the Transport of Deep Carbon

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 267 ◽  
Author(s):  
Vincenzo Stagno ◽  
Veronica Stopponi ◽  
Yoshio Kono ◽  
Annalisa D’Arco ◽  
Stefano Lupi ◽  
...  
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Atomic Structure ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
High Pressure And Temperature ◽  
X Ray ◽  
Falling Sphere ◽  
Basaltic Melts

Understanding the viscosity of mantle-derived magmas is needed to model their migration mechanisms and ascent rate from the source rock to the surface. High pressure–temperature experimental data are now available on the viscosity of synthetic melts, pure carbonatitic to carbonate–silicate compositions, anhydrous basalts, dacites and rhyolites. However, the viscosity of volatile-bearing melilititic melts, among the most plausible carriers of deep carbon, has not been investigated. In this study, we experimentally determined the viscosity of synthetic liquids with ~31 and ~39 wt% SiO2, 1.60 and 1.42 wt% CO2 and 5.7 and 1 wt% H2O, respectively, at pressures from 1 to 4.7 GPa and temperatures between 1265 and 1755 °C, using the falling-sphere technique combined with in situ X-ray radiography. Our results show viscosities between 0.1044 and 2.1221 Pa·s, with a clear dependence on temperature and SiO2 content. The atomic structure of both melt compositions was also determined at high pressure and temperature, using in situ multi-angle energy-dispersive X-ray diffraction supported by ex situ microFTIR and microRaman spectroscopic measurements. Our results yield evidence that the T–T and T–O (T = Si,Al) interatomic distances of ultrabasic melts are higher than those for basaltic melts known from similar recent studies. Based on our experimental data, melilititic melts are expected to migrate at a rate ~from 2 to 57 km·yr−1 in the present-day or the Archaean mantle, respectively.

In situ determination of the spinel-post-spinel transition in Fe3O4 at high pressure and temperature by synchrotron X-ray diffraction

2011 ◽  
Vol 96 (5-6) ◽  
pp. 820-827 ◽  
Author(s):  
K. Schollenbruch ◽  
A. B. Woodland ◽  
D. J. Frost ◽  
Y. Wang ◽  
T. Sanehira ◽  
...  
Keyword(s):  
High Pressure ◽  
X Ray Diffraction ◽  
High Pressure And Temperature ◽  
X Ray

scholarly journals In situ X–ray diffraction studies of hydrous aluminosilicate at high pressure and temperature

2018 ◽  
Vol 113 (2) ◽  
pp. 106-111 ◽  
Author(s):  
Ryota ABE ◽  
Yuki SHIBAZAKI ◽  
Shin OZAWA ◽  
Itaru OHIRA ◽  
Hiromu TOBE ◽  
...  
Keyword(s):  
High Pressure ◽  
X Ray Diffraction ◽  
High Pressure And Temperature ◽  
X Ray

Combined resistive and laser heating technique for in situ radial X-ray diffraction in the diamond anvil cell at high pressure and temperature

2013 ◽  
Vol 84 (2) ◽  
pp. 025118 ◽  
Author(s):  
Lowell Miyagi ◽  
Waruntorn Kanitpanyacharoen ◽  
Selva Vennila Raju ◽  
Pamela Kaercher ◽  
Jason Knight ◽  
...  
Keyword(s):  
High Pressure ◽  
Laser Heating ◽  
Diamond Anvil Cell ◽  
X Ray Diffraction ◽  
High Pressure And Temperature ◽  
X Ray ◽  
Diamond Anvil

High-Pressure and High-Temperature Stability of Antifluorite Mg2C by in Situ X-ray Diffraction and ab Initio Calculations

2014 ◽  
Vol 118 (15) ◽  
pp. 8128-8133 ◽  
Author(s):  
Oleksandr O. Kurakevych ◽  
Yann Le Godec ◽  
Timothy A. Strobel ◽  
Duck Young Kim ◽  
Wilson A. Crichton ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Temperature Stability ◽  
High Temperature Stability ◽  
X Ray Diffraction ◽  
X Ray

Strength measurement of boron suboxide B6O at high pressure and temperature using in situ synchrotron X-ray diffraction

2008 ◽  
Vol 28 (3) ◽  
pp. 423-430 ◽  
Author(s):  
Jiuhua Chen ◽  
Yunpeng Yang ◽  
Tony Yu ◽  
Jianzhong Zhang ◽  
Yusheng Zhao ◽  
...  
Keyword(s):  
High Pressure ◽  
X Ray Diffraction ◽  
Strength Measurement ◽  
High Pressure And Temperature ◽  
X Ray ◽  
Boron Suboxide

scholarly journals Pressure-induced Jahn-Teller Switch in the Homoleptic Hybrid Perovskite [(CH3)2NH2]Cu(HCOO)3: Orbital Reordering by Unconventional Degrees of Freedom

2021 ◽  
Author(s):  
Rebecca Scatena ◽  
Michał Andrzejewski ◽  
Roger D Johnson ◽  
Piero Macchi
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Coordination Polymer ◽  
Degrees Of Freedom ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hybrid Perovskite ◽  
Jahn Teller

Through in-situ, high-pressure x-ray diffraction experiments we have shown that the homoleptic perovskite-like coordination polymer [(CH3)2NH2]Cu(HCOO)3 undergoes a pressure-induced orbital reordering phase transition above 5.20 GPa. This transition is distinct...

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