Cryogenic gas loading in a Mao–Bell-type diamond anvil cell for high pressure-high temperature investigations

2008 ◽  
Vol 79 (7) ◽  
pp. 076103 ◽  
Author(s):  
M. Sekar ◽  
N. R. Sanjay Kumar ◽  
P. Ch. Sahu ◽  
N. V. Chandra Shekar ◽  
N. Subramanian
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Diamond Anvil Cell ◽  
High Pressure High Temperature ◽  
Diamond Anvil

Optical pressure sensors for high-pressure–high-temperature studies in a diamond anvil cell

2007 ◽  
Vol 27 (4) ◽  
pp. 447-463 ◽  
Author(s):  
F. Datchi ◽  
A. Dewaele ◽  
P. Loubeyre ◽  
R. Letoullec ◽  
Y. Le Godec ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Diamond Anvil Cell ◽  
Pressure Sensors ◽  
High Pressure High Temperature ◽  
Diamond Anvil ◽  
Optical Pressure

scholarly journals The Phase Transition and Dehydration in Epsomite under High Temperature and High Pressure

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 75 ◽  
Author(s):  
Linfei Yang ◽  
Lidong Dai ◽  
Heping Li ◽  
Haiying Hu ◽  
Meiling Hong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
High Pressure ◽  
High Temperature ◽  
Magnesium Sulfate ◽  
Room Temperature ◽  
Diamond Anvil Cell ◽  
Vibrational Modes ◽  
Diamond Anvil ◽  
T Phase

The phase stability of epsomite under a high temperature and high pressure were explored through Raman spectroscopy and electrical conductivity measurements in a diamond anvil cell up to ~623 K and ~12.8 GPa. Our results verified that the epsomite underwent a pressure-induced phase transition at ~5.1 GPa and room temperature, which was well characterized by the change in the pressure dependence of Raman vibrational modes and electrical conductivity. The dehydration process of the epsomite under high pressure was monitored by the variation in the sulfate tetrahedra and hydroxyl modes. At a representative pressure point of ~1.3 GPa, it was found the epsomite (MgSO4·7H2O) started to dehydrate at ~343 K, by forming hexahydrite (MgSO4·6H2O), and then further transformed into magnesium sulfate trihydrate (MgSO4·3H2O) and anhydrous magnesium sulfate (MgSO4) at higher temperatures of 373 and 473 K, respectively. Furthermore, the established P-T phase diagram revealed a positive relationship between the dehydration temperature and the pressure for epsomite.

scholarly journals Experimental method for in situ determination of material textures at simultaneous high pressure and high temperature by means of radial diffraction in the diamond anvil cell

2009 ◽  
Vol 80 (10) ◽  
pp. 104501 ◽  
Author(s):  
Hanns-Peter Liermann ◽  
Sébastien Merkel ◽  
Lowell Miyagi ◽  
Hans-Rudolf Wenk ◽  
Guoyin Shen ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Experimental Method ◽  
Diamond Anvil Cell ◽  
Diamond Anvil

A diamond anvil cell with resistive heating for high pressure and high temperature x-ray diffraction and absorption studies

2008 ◽  
Vol 79 (8) ◽  
pp. 085103 ◽  
Author(s):  
Sebastien Pasternak ◽  
Giuliana Aquilanti ◽  
Sakura Pascarelli ◽  
Roberta Poloni ◽  
Bernard Canny ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Diamond Anvil Cell ◽  
X Ray Diffraction ◽  
Resistive Heating ◽  
X Ray ◽  
Absorption Studies ◽  
Diamond Anvil

scholarly journals Carbide Formation in Refractory Mo15Nb20Re15Ta30W20 Alloy under a Combined High-Pressure and High-Temperature Condition

Entropy ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. 718
Author(s):  
Congyan Zhang ◽  
Uttam Bhandari ◽  
Congyuan Zeng ◽  
Huan Ding ◽  
Shengmin Guo ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Mechanical Performance ◽  
Ambient Pressure ◽  
High Entropy Alloy ◽  
Carbide Formation ◽  
High Entropy ◽  
Temperature Conditions ◽  
High Pressure High Temperature ◽  
Diamond Anvil

In this work, the formation of carbide with the concertation of carbon at 0.1 at.% in refractory high-entropy alloy (RHEA) Mo15Nb20Re15Ta30W20 was studied under both ambient and high-pressure high-temperature conditions. The x-ray diffraction of dilute carbon (C)-doped RHEA under ambient pressure showed that the phases and lattice constant of RHEA were not influenced by the addition of 0.1 at.% C. In contrast, C-doped RHEA showed unexpected phase formation and transformation under combined high-pressure and high-temperature conditions by resistively employing the heated diamond anvil cell (DAC) technique. The new FCC_L12 phase appeared at 6 GPa and 809 °C and preserved the ambient temperature and pressure. High-pressure and high-temperature promoted the formation of carbides Ta3C and Nb3C, which are stable and may further improve the mechanical performance of the dilute C-doped alloy Mo15Nb20Re15Ta30W20.

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