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Metallization and molecular dissociation of dense fluid nitrogen.

Abstract：

:Diatomic nitrogen is an archetypal molecular system known for its exceptional stability and complex behavior at high pressures and temperatures, including rich solid polymorphism, formation of energetic states, and an insulator-to-metal transformation coupled to a change in chemical bonding. However, the thermobaric conditions of the fluid molecular-polymer phase boundary and associated metallization have not been experimentally established. Here, by applying dynamic laser heating of compressed nitrogen and using fast optical spectroscopy to study electronic properties, we observe a transformation from insulating (molecular) to conducting dense fluid nitrogen at temperatures that decrease with pressure and establish that metallization, and presumably fluid polymerization, occurs above 125 GPa at 2500 K. Our observations create a better understanding of the interplay between molecular dissociation, melting, and metallization revealing features that are common in simple molecular systems.

journal_name

Nat Commun

journal_title

Nature communications

authors

Jiang S,Holtgrewe N,Lobanov SS,Su F,Mahmood MF,McWilliams RS,Goncharov AF

doi

10.1038/s41467-018-05011-z

subject

Has Abstract

pub_date

2018-07-06 00:00:00

pages

2624

issue

1

issn

2041-1723

pii

10.1038/s41467-018-05011-z

journal_volume

9

pub_type

杂志文章

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