In situ observations and quantitative raman spectroscopic analyses of samples in high-pressure optical cells in hydrothermal experiments

2021 ◽  
Author(s):  
I-Ming Chou
Keyword(s):  
High Pressure ◽  
Raman Spectroscopic ◽  
Hydrothermal Experiments ◽  
Spectroscopic Analyses ◽  
In Situ Observations

In Situ Observations of High-Pressure Phase Transformations in a Synthetic Methane Hydrate

2002 ◽  
Vol 106 (1) ◽  
pp. 30-33 ◽  
Author(s):  
Hiroyasu Shimizu ◽  
Tatsuya Kumazaki ◽  
Tetsuji Kume ◽  
Shigeo Sasaki
Keyword(s):  
High Pressure ◽  
Phase Transformations ◽  
Methane Hydrate ◽  
High Pressure Phase ◽  
In Situ Observations ◽  
Pressure Phase

Behavior of phengite at high temperature and high pressure: In situ IR and Raman spectroscopic studies

2019 ◽  
Author(s):  
WENDI Liu ◽  
Yan Yang ◽  
Zeming Qi ◽  
Zhongping Wang ◽  
Weihua Huang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Spectroscopic Studies ◽  
Raman Spectroscopic ◽  
In Situ Ir ◽  
Ir And Raman

scholarly journals High-Pressure Raman Spectroscopy and X-ray Diffraction Study on Scottyite, BaCu2Si2O7

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 608
Author(s):  
Pei-Lun Lee ◽  
Eugene Huang ◽  
Jennifer Kung
Keyword(s):  
High Pressure ◽  
Vibration Modes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Raman Spectroscopic ◽  
Diamond Anvil ◽  
Compression Data ◽  
Diffraction Patterns ◽  
Murnaghan Equation

In situ high-pressure synchrotron X-ray diffraction and Raman spectroscopic experiments of scottyite, BaCu2Si2O7, were carried out in a diamond anvil cell up to 21 GPa at room temperature. X-ray diffraction patterns reveal four new peaks near 3.5, 3.1, 2.6 and 2.2 Å above 8 GPa, while some peaks of the original phase disappear above 10 GPa. In the Raman experiment, we observed two discontinuities in dν/dP, the slopes of Raman wavenumber (ν) of some vibration modes versus pressure (P), at approximately 8 and 12 GPa, indicating that the Si-O symmetrical and asymmetrical vibration modes change with pressure. Fitting the compression data to Birch–Murnaghan equation yields a bulk modulus of 102 ± 5 GPa for scottyite, assuming Ko′ is four. Scottyite shows anisotropic compressibility along three crystallographic axes, among which c-axis was the most compressible axis, b-axis was the last and a-axis was similar to the c-axis on the compression. Both X-ray and Raman spectroscopic data provide evidences that scottyite undergoes a reversible phase transformation at 8 GPa.

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