Raman modes of the two-dimensional tetragonal polymeric phase of C60 under high pressure

2001 ◽  
Vol 114 (20) ◽  
pp. 9099-9104 ◽  
Author(s):  
J. Arvanitidis ◽  
K. P. Meletov ◽  
K. Papagelis ◽  
S. Ves ◽  
G. A. Kourouklis ◽  
...  
Keyword(s):  
High Pressure ◽  
Two Dimensional ◽  
Raman Modes

Features of spatial shock-wave flows in vapor-gas-liquid mixtures

2014 ◽  
Vol 10 ◽  
pp. 27-31
Author(s):  
R.Kh. Bolotnova ◽  
U.O. Agisheva ◽  
V.A. Buzina
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Shock Waves ◽  
Liquid Mixture ◽  
Liquid Mixtures ◽  
Pressure Vessels ◽  
Water Mixture ◽  
Two Dimensional ◽  
Nonstationary Processes ◽  
Two Phase

The two-phase model of vapor-gas-liquid medium in axisymmetric two-dimensional formulation, taking into account vaporization is constructed. The nonstationary processes of boiling vapor-water mixture outflow from high-pressure vessels as a result of depressurization are studied. The problems of shock waves action on filled by gas-liquid mixture volumes are solved.

Theoretical study of Raman modes in high-pressure phases of Si, Ge, and Sn

1993 ◽  
Vol 48 (6) ◽  
pp. 3646-3653 ◽  
Author(s):  
Steven P. Lewis ◽  
Marvin L. Cohen
Keyword(s):  
High Pressure ◽  
Theoretical Study ◽  
Raman Modes

Two-dimensional simulations of droplet evaporation and deformation at high pressure

1992 ◽  
Author(s):  
ZHENG-TAO DENG ◽  
RON LITCHFORD ◽  
SHENGHUN JENG ◽  
SAN-MOU JENG
Keyword(s):  
High Pressure ◽  
Droplet Evaporation ◽  
Two Dimensional

scholarly journals Phase Stability and Vibrational Properties of Iron-Bearing Carbonates at High Pressure

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1142
Author(s):  
Chaoshuai Zhao ◽  
Liangxu Xu ◽  
Weibin Gui ◽  
Jin Liu
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Spin Transition ◽  
Laser Raman ◽  
Electronic Spin ◽  
Pressure Medium ◽  
Raman Modes ◽  
Sample Chamber ◽  
The Stability ◽  
Iron Bearing

The spin transition of iron can greatly affect the stability and various physical properties of iron-bearing carbonates at high pressure. Here, we reported laser Raman measurements on iron-bearing dolomite and siderite at high pressure and room temperature. Raman modes of siderite FeCO3 were investigated up to 75 GPa in the helium (He) pressure medium and up to 82 GPa in the NaCl pressure medium, respectively. We found that the electronic spin-paring transition of iron in siderite occurred sharply at 42–44 GPa, consistent with that in the neon (Ne) pressure medium in our previous study. This indicated that the improved hydrostaticity from Ne to He had minimal effects on the spin transition pressure. Remarkably, the spin crossover of siderite was broadened to 38–48 GPa in the NaCl pressure medium, due to the large deviatoric stress in the sample chamber. In addition, Raman modes of iron-bearing dolomite Ca1.02Mg0.76Fe0.20Mn0.02(CO3)2 were explored up to 58 GPa by using argon as a pressure medium. The sample underwent phase transitions from dolomite-Ⅰ to -Ⅰb phase at ~8 GPa, and then to -Ⅱ at ~15 and -Ⅲb phase at 36 GPa, while no spin transition was observed in iron-bearing dolomite up to 58 GPa. The incorporation of FeCO3 by 20 mol% appeared to marginally decrease the onset pressures of the three phase transitions aforementioned for pure dolomite. At 55–58 GPa, the ν1 mode shifted to a lower frequency at ~1186 cm−1, which was likely associated with the 3 + 1 coordination in dolomite-Ⅲb. These results shed new insights into the nature of iron-bearing carbonates at high pressure.

scholarly journals High-pressure and high-temperature synthesis of rhenium carbide using rhenium and nanoscale amorphous two-dimensional carbon nitride

2015 ◽  
Vol 2 (1) ◽  
pp. 1076702 ◽  
Author(s):  
Nozomu Yasui ◽  
Masaya Sougawa ◽  
Masaaki Hirai ◽  
Kaoru Yamamoto ◽  
Taku Okada ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Carbon Nitride ◽  
Two Dimensional ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

High-pressure behavior of Raman modes inCuGaS2

1992 ◽  
Vol 46 (23) ◽  
pp. 15092-15101 ◽  
Author(s):  
J. González ◽  
B. J. Fernández ◽  
J. M. Besson ◽  
M. Gauthier ◽  
A. Polian
Keyword(s):  
High Pressure ◽  
Pressure Behavior ◽  
Raman Modes

High resolution13C NMR studies of one- and two-dimensional polymerized C60 under high pressure

1997 ◽  
Vol 58 (11) ◽  
pp. 1645-1647 ◽  
Author(s):  
F. Rachdi ◽  
C. Goze ◽  
L. Hajji ◽  
M. Nún˜ez-Regueiro ◽  
L. Marques ◽  
...  
Keyword(s):  
High Pressure ◽  
Two Dimensional ◽  
Nmr Studies
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