Chemical reactions and transformations at high pressures. The role of the solvent in chemical reactions, as revealed by high pressure studies

1956 ◽  
Vol 22 ◽  
pp. 88 ◽  
Author(s):  
K. J. Laidler
Keyword(s):  
High Pressure ◽  
Chemical Reactions ◽  
High Pressures ◽  
High Pressure Studies

High Pressure Studies of Quantum Well Emission and Deep Emission in GaInP(ordered)-GaAs Heterostructures

1997 ◽  
Vol 499 ◽  
Author(s):  
S. H. Kwok ◽  
P. Y. Yu ◽  
K. Uchida ◽  
T. Arai
Keyword(s):  
High Pressure ◽  
Quantum Well ◽  
Emission Band ◽  
Excitation Power ◽  
High Excitation ◽  
High Pressure Studies ◽  
Band Alignments ◽  
High Pressure Study

ABSTRACTWe report on a high pressure study of emission from a series of GaInP(ordered)/GaAs heterostructures. A so-called “deep emission” band at 1.46 eV is observed in all our samples. At high excitation power, quantum well emission emerges in only one structure where thin GaP layers are inserted on both sides of the GaAs well. From the pressure dependent emission in this sample we have determined its band alignments. The role of the GaP layers in suppressing the deep emission is elucidated.

HIGH METALLIC RESISTIVITIES AND RESISTIVITY SATURATION: HIGH-PRESSURE AND THERMAL EXPANSION EFFECTS

1993 ◽  
Vol 07 (08) ◽  
pp. 491-499 ◽  
Author(s):  
BERTIL SUNDQVIST
Keyword(s):  
High Pressure ◽  
Thermal Expansion ◽  
High Pressures ◽  
Measured Temperature ◽  
Metallic Materials ◽  
High Pressure Studies ◽  
Graphite Intercalation ◽  
Recent Developments ◽  
High Transition ◽  
Source Of Information

Some recent developments in the field of resistivity saturation in metallic materials are discussed, concentrating on effects of thermal expansion and high pressures. It is shown that thermal expansion effects can significantly modify the measured temperature dependence of the resistivity, and that high pressure studies are an important, but little used, source of information. Examples are shown for transition metals and alloys, high transition temperature superconductors, and graphite intercalation compounds.

Materials Research at University of Nevada, Las Vegas

2016 ◽  
Vol 879 ◽  
pp. 386-389
Author(s):  
Ravhi S. Kumar ◽  
Weldu Gabrimicael ◽  
Andrew L. Cornelius
Keyword(s):  
High Pressure ◽  
Interdisciplinary Research ◽  
High Pressures ◽  
Las Vegas ◽  
Science And Engineering ◽  
High Pressure Studies ◽  
Materials Research ◽  
Potential Applications ◽  
Indirect Band Gap ◽  
The Relationship

High-pressure studies on thermoelectric materials allow the study of the relationship between structural, elastic, and electronic properties. The High Pressure Science and Engineering Center (HiPSEC) at UNLV performs interdisciplinary research on a wide variety of materials at high pressures. One such system, CrSi2 is an indirect band gap semiconductor that has potential applications in solar cells.

scholarly journals Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies

2014 ◽  
Vol 89 (9) ◽  
Author(s):  
Peiwen Gao ◽  
Rong Yu ◽  
Liling Sun ◽  
Hangdong Wang ◽  
Zhen Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Iron Selenide ◽  
High Pressure Studies

scholarly journals High-pressure diffraction studies of molecular organic solids. A personal view

2007 ◽  
Vol 64 (1) ◽  
pp. 218-231 ◽  
Author(s):  
Elena V. Boldyreva
Keyword(s):  
High Pressure ◽  
Solid State ◽  
High Pressures ◽  
Experimental Studies ◽  
Personal View ◽  
Organic Solids ◽  
High Pressure Studies

This paper discusses the trends in the experimental studies of molecular organic solids at high pressures by diffraction techniques. Crystallization of liquids, crystallization from solutions and solid-state transformations are considered. Special attention is paid to the high-pressure studies of pharmaceuticals and of biomimetics.

High Pressure Materials Physics Research at UNLV

2014 ◽  
Vol 783-786 ◽  
pp. 1836-1838
Author(s):  
Andrew L. Cornelius ◽  
Brant Abeln ◽  
Daniel Antonio ◽  
Jason Baker ◽  
Patricia E. Kalita ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressures ◽  
Ambient Pressure ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron ◽  
High Pressure Studies ◽  
Heat Capacity Measurements

High-pressure studies on strongly correlated-electron systems allow the study of the relationship between structural, elastic, electronic, and magnetic properties of d-and f-band systems. The High Pressure Science and Engineering Center (HiPSEC) at UNLV performs interdisciplinary research on a wide variety of materials at high pressures. One such system, YbB2 displays antiferromagnet order at ambient pressure. We present heat capacity measurements at high magnetic fields to 9 T and structural measurement at pressures up to 5 GPa on YbB2.

High pressure studies of high Tc superconductors in A–Cu–O system: The role of apical oxygen

2007 ◽  
Vol 460-462 ◽  
pp. 178-181 ◽  
Author(s):  
C.Q. Jin ◽  
Q.Q. Liu ◽  
H. Yang ◽  
L.X. Yang ◽  
R.C. Yu ◽  
...  
Keyword(s):  
High Pressure ◽  
Apical Oxygen ◽  
High Tc Superconductors ◽  
High Tc ◽  
High Pressure Studies

High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures

2008 ◽  
Vol 1104 ◽  
Author(s):  
Yogesh K. Vohra ◽  
Bagvanth Reddy Sangala ◽  
Andrew K. Stemshorn ◽  
Kevin M. Hope
Keyword(s):  
High Pressure ◽  
Rare Earth ◽  
High Pressures ◽  
Rare Earth Metals ◽  
Earth Metal ◽  
Heavy Rare Earth ◽  
High Pressure Studies ◽  
Volume Collapse ◽  
Diamond Anvil ◽  
Heavy Actinide

AbstractHigh-pressure studies have been performed on heavy rare earth metals Terbium (Tb) to 155 GPa and Holmium (Ho) to 134 GPa in a diamond anvil cell at room temperature. The following crystal structure sequence was observed in both metals hcp ⟶ Sm-type ⟶ dhcp ⟶ distorted fcc (hR-24) ⟶ monoclinic (C2/m) with increasing pressure. The last transformation to a low symmetry monoclinic phase is accompanied by a volume collapse of 5 % for Tb at 51 GPa and a volume collapse of 3 % for Ho at 103 GPa. This volume collapse under high pressure is reminiscent of f-shell delocalization in light rare earth metal Cerium (Ce), Praseodymium (Pr), and heavy actinide metals Americium (Am) and Curium (Cm). The orthorhombic Pnma phase that has been reported in Am and Cm after f-shell delocalization is not observed in heavy rare earth metals under high pressures.

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