New Phase Transformation in InSb at High Pressure and High Temperature

1967 ◽  
Vol 38 (5) ◽  
pp. 2042-2046 ◽  
Author(s):  
M. D. Banus ◽  
Mary C. Lavine
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
High Temperature ◽  
New Phase

High temperature-high pressure synthesis of a new phase of LaCuO3

1989 ◽  
Vol 137 (4-5) ◽  
pp. 205-206 ◽  
Author(s):  
A.W. Webb ◽  
E.F. Skelton ◽  
S.B. Qadri ◽  
E.R. Carpenter ◽  
M.S. Osofsky ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
High Pressure Synthesis ◽  
Pressure Synthesis ◽  
New Phase ◽  
High Temperature High Pressure

X-ray evidence for the new phase β-iron at high temperature and high pressure

1996 ◽  
Vol 23 (18) ◽  
pp. 2441-2444 ◽  
Author(s):  
S. K. Saxena ◽  
L. S. Dubrovinsky ◽  
P. Häggkvist
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
X Ray ◽  
New Phase

scholarly journals Three different Ge environments in a new Sr5CuGe9O24 phase synthesized at high pressure and high temperature

2020 ◽  
Vol 76 (5) ◽  
pp. 727-732
Author(s):  
Holger Klein ◽  
Stéphanie Kodjikian ◽  
Rémy Philippe ◽  
Lei Ding ◽  
Claire V. Colin ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Direct Methods ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Cell Parameters ◽  
Structure Solution ◽  
Tomography Method ◽  
New Phase

In the framework of expanding the range of copper-based compounds in the pyroxene family, we have synthesized at high pressure and high temperature a powder containing a mixture of a new phase with stoichiometry Sr5CuGe9O24 having two identified impurity phases. Electron crystallography showed that the new phase crystallizes in the monoclinic space group P2/c, with unit-cell parameters a = 11.8 Å, b = 8.1 Å, c = 10.3 Å and β = 101.3°. We applied the recently developed low-dose electron diffraction tomography method to solve the structure by direct methods. The obtained structure model contains all 9 independent cation positions and all 13 oxygen positions. A subsequent refinement against powder X-ray diffraction data ascertained the high quality of the structure solution, in particular, the unusual structural arrangement that there are three different environments for Ge in this phase.

High-pressure phase transformation of BeGa2O4

1993 ◽  
Vol 8 (7) ◽  
pp. 1721-1727 ◽  
Author(s):  
K. Nakamura ◽  
M. Machida ◽  
M.E. Brito ◽  
H. Tabata
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Elevated Temperatures ◽  
High Pressure Phase ◽  
Type Structure ◽  
Temperature Phase ◽  
Temperature Ranges ◽  
The Stability ◽  
New Phase ◽  
Pressure Phase

High-pressure phase transformation of beryllium gallium oxide (BeGa2O4) has been studied. Applying high pressure at elevated temperatures to the original hexagonal BeGa2O4 (β–Si3N4-type structure), a high-pressure modification with orthorhombic structure (olivine-type structure) was obtained, i.e., o-BeGa2O4. Lattice parameters of the new phase were determined to be a = 0.5698, b = 0.9759, and c = 0.4551 nm. The pressure and temperature ranges where the high-pressure phase was observed are 3.5 to 7.5 GPa and 800 to 1600 °C, respectively. A tentative pressure-temperature phase diagram for BeGa2O4 was proposed. Transformation is not straightforward; decomposition of the original phase into single oxides and their recombination to form o-BeGa2O4 are necessary. This process seems to apply in both ways, formation and decomposition of the high-pressure phase. The stability of the high-pressure phase is explained in terms of the total molar volume for the phase, the result of summing up molar volumes of constituent compounds. This is the first known report on transformation of β–Si3N4-type structure into a denser structure.

Time-Resolved Picosecond Optical Study of Laser-Excited Graphite

1985 ◽  
Vol 51 ◽  
Author(s):  
C. Y. Huang ◽  
A. M. Malvezzi ◽  
J. N. Liu ◽  
N. Bloembergen
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Temperature Gradient ◽  
Threshold Fluence ◽  
Optical Study ◽  
Time Resolved ◽  
High Temperature Gradient ◽  
Probe Technique ◽  
Pump And Probe ◽  
New Phase

ABSTRACTThe pump-and-probe technique is employed to perform picosecond timeresolved measurements of the reflectivity changes in highly oriented pyrolitic graphite excited by 0.532-μm pump pulses. At low pump fluences, the presence of a short-lived plasma and a high-temperature gradient gives rise to an increase in the reflectivity probed at 1.9 μm but causes a decrease at 1.064 μm. At the threshold fluence, 140 mJ/cm2, the reflectivity drops abruptly, marking a phase transformation. Above the threshold, the reflectivity drops to -0.2 from its original value of 0.42 at 1.064 μm and to -0.4 from its ambient value of 0.50 at 1.9 μm. This new phase persists only for a few nanoseconds.

Phase transformation of cadmium sulfide under high temperature and high pressure conditions

2014 ◽  
Vol 16 (28) ◽  
pp. 14899 ◽  
Author(s):  
Jianwei Xiao ◽  
Bin Wen ◽  
Roderick Melnik ◽  
Yoshiyuki Kawazoe ◽  
Xiangyi Zhang
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
High Temperature ◽  
Cadmium Sulfide
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