High-Pressure Behavior of Hydrogen and Deuterium at Low Temperatures

High-Pressure Behavior of Hydrogen and Deuterium at Low Temperatures In situ high-pressure low-temperature high-quality Raman data for hydrogen and deuterium demonstrate the presence of a novel phase, phase II′, unique to deuterium and distinct from the known phase II. Phase II′ of D2 is not observed in hydrogen, making it the only phase that does not exist in both isotopes and occupies a significant part of P-T space from ∼25 to 110 GPa and below 125 K. For H2, the data show that below 30 K the transition to phase II happens at as low as 73 GPa. The transformation from phase II to III commences at around ∼155  GPa and is completed by 170 GPa with the average pressure of ∼160  GPa being slightly higher than previously thought. The updated phase diagrams of H2 and D2 demonstrate the difference between the isotopes at low temperatures and moderate pressures, providing new information on the phase diagrams of both elements. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

High-Pressure Behavior of Hydrogen and Deuterium at Low Temperatures

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High-Pressure Behavior of Hydrogen and Deuterium at Low Temperatures

Abstract

In situ high-pressure low-temperature high-quality Raman data for hydrogen and deuterium demonstrate the presence of a novel phase, phase II′, unique to deuterium and distinct from the known phase II. Phase II′ of D2 is not observed in hydrogen, making it the only phase that does not exist in both isotopes and occupies a significant part of P-T space from ∼25 to 110 GPa and below 125 K. For H2, the data show that below 30 K the transition to phase II happens at as low as 73 GPa. The transformation from phase II to III commences at around ∼155  GPa and is completed by 170 GPa with the average pressure of ∼160  GPa being slightly higher than previously thought. The updated phase diagrams of H2 and D2 demonstrate the difference between the isotopes at low temperatures and moderate pressures, providing new information on the phase diagrams of both elements.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
0031-9007
eISSN
1079-7114
D.O.I.
10.1103/PhysRevLett.119.065301
Publisher site
See Article on Publisher Site

Abstract

In situ high-pressure low-temperature high-quality Raman data for hydrogen and deuterium demonstrate the presence of a novel phase, phase II′, unique to deuterium and distinct from the known phase II. Phase II′ of D2 is not observed in hydrogen, making it the only phase that does not exist in both isotopes and occupies a significant part of P-T space from ∼25 to 110 GPa and below 125 K. For H2, the data show that below 30 K the transition to phase II happens at as low as 73 GPa. The transformation from phase II to III commences at around ∼155  GPa and is completed by 170 GPa with the average pressure of ∼160  GPa being slightly higher than previously thought. The updated phase diagrams of H2 and D2 demonstrate the difference between the isotopes at low temperatures and moderate pressures, providing new information on the phase diagrams of both elements.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Aug 11, 2017

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