Structural aspects of solid iodine associated with metallization and molecular dissociation under high pressure

Copper of different purity levels (4N, 5N) produced by High Pressure Torsion (HPT) with varying processing parameters is investigated utilizing the radiotracer technique. While the degree of deformation is constant, the effect of the applied quasi-hydrostatic pressure and of the impurity concentration on the as deformed samples is analysed. By applying the radio tracer method micro structural aspects are revealed that are not easily accessible by conventional methods. The measurements indicate the formation of a percolating porosity during the HPT process as a function of the applied pressure and (although less pronounced) of the impurity concentration.

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Amorphization and Molecular Dissociation ofSnI4at High Pressure

Physical Review Letters ◽

10.1103/physrevlett.79.4597 ◽

1997 ◽

Vol 79 (23) ◽

pp. 4597-4600 ◽

Cited By ~ 46

Author(s):

N. Hamaya ◽

K. Sato ◽

K. Usui-Watanabe ◽

K. Fuchizaki ◽

Y. Fujii ◽

...

Keyword(s):

High Pressure ◽

Molecular Dissociation

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Molecular dissociation and two low-temperature high-pressure phases ofH2S

Physical Review B ◽

10.1103/physrevb.69.214102 ◽

2004 ◽

Vol 69 (21) ◽

Cited By ~ 33

Author(s):

Hiroshi Fujihisa ◽

Hiroshi Yamawaki ◽

Mami Sakashita ◽

Atsuko Nakayama ◽

Takahiro Yamada ◽

...

Keyword(s):

High Pressure ◽

Low Temperature ◽

Molecular Dissociation

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Structural phase transitions in iodine under high pressure

Zeitschrift für Kristallographie - Crystalline Materials ◽

10.1524/zkri.219.11.749.52434 ◽

2004 ◽

Vol 219 (11) ◽

Cited By ~ 5

Author(s):

Kenichi Takemura ◽

Kyoko Sato ◽

Hiroshi Fujihisa ◽

Mitsuko Onoda

Keyword(s):

High Pressure ◽

Intermediate Phase ◽

Structural Phase ◽

Transient State ◽

Structural Phase Transitions ◽

X Ray Diffraction ◽

Molecular Dissociation ◽

Interatomic Distances ◽

X Ray ◽

Insight Into

AbstractHigh-pressure powder X-ray diffraction experiments have been carried out on solid iodine at room temperature. A new intermediate phase V has been identified in the pressure range 24–28 GPa, in the close vicinity of the pressure-induced molecular dissociation. The structure is incommensurately modulated, a rare case for elemental solids. The nearest interatomic distances are distributed over a range 2.8–3.2 Å, which characterizes phase V as a transient state between the molecular and monatomic states. We discuss the overall change of the crystal structure of iodine with pressure, which gives an insight into the process of molecular formation and dissociation.

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Molecular Dissociation in Deuterium Sulfide under High Pressure: Infrared and Raman Study

The Journal of Physical Chemistry A ◽

10.1021/jp001625m ◽

2000 ◽

Vol 104 (38) ◽

pp. 8838-8842 ◽

Cited By ~ 15

Author(s):

Mami Sakashita ◽

H. Fujihisa ◽

H. Yamawaki ◽

K. Aoki

Keyword(s):

High Pressure ◽

Molecular Dissociation ◽

Raman Study

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High-Pressure X-Ray Diffraction Studies of Elastic Anomalies in Superlattice

MRS Proceedings ◽

10.1557/proc-231-355 ◽

1991 ◽

Vol 231 ◽

Cited By ~ 1

Author(s):

Y. Fujii ◽

Y. Ohishi ◽

H. Konishi ◽

N. Nakayama ◽

T. Shinjo

Keyword(s):

Phase Transition ◽

High Pressure ◽

Diamond Anvil Cell ◽

Orthorhombic Phase ◽

X Ray Diffraction ◽

X Ray ◽

Layer Stacking ◽

Diamond Anvil ◽

Elastic Anomalies ◽

Structural Aspects

AbstractThis paper has made an overview on elastic and structural aspects of three distinct superlattices under hydrostatic pressure up to about 8GPa, which were studied by our unique x-ray diffraction technique incorporated with a diamond-anvil cell. They are metallic fcc/fcc Au/Ni, bcc/fcc Mo/Ni, and semiconductive epitaxially-grown PbSe/SnSe superlattices. In their layer-stacking direction, both metallic superlattices show the supermodulus behavior while the semiconductive one doesn't. However, its pressure-driven cubic-to-orthorhombic phase transition, successively taking place in the SnSe and PbSe layers, has been found to significantly shift by stress due to its epitaxial growth.

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