Up to 17 GPa, the crystalline phases of N2 are characterized by pronounced orientational disorder, whereas the higher-pressure phases of molecular N2 are ordered. This raises the question about long-term relaxation of orientational disorder within the low- to intermediate-pressure regime. Here, this question is addressed by comparing synthetic with natural, chemically pure, solid N2 that resides as inclusions in diamonds at 300 K for about 108 years at pressures up to 11 GPa. It is shown that disorder prevails at 8.7 GPa, 300 K, where both synthetic and natural N2 assume the same structure. However, at 10.8 GPa, natural solid N2 exhibits monoclinic distortion and partial orientational ordering of the molecules, both of which are not observed in synthetic material. This difference is interpreted as the result of long-term structural relaxation. The ordering mechanism is examined and placed into the context of the δ- to ε-N2 transition. We present explanations for the absence of complete ordering of δ-N2.
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28 November 2024
Research Article|
November 27 2024
Long-term relaxation of orientational disorder and structural modifications in molecular nitrogen at high pressure
Oliver Tschauner
;
Oliver Tschauner
a)
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Supervision, Writing – original draft, Writing – review & editing)
1
Department of Geoscience, University of Nevada Las Vegas
, 4505 Maryland Parkway, Las Vegas, Nevada 89154, USA
a)Author to whom correspondence should be addressed: [email protected]
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Oded Navon
;
Oded Navon
(Conceptualization, Data curation, Writing – review & editing)
2
The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University
, Jerusalem 91904, Israel
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Christian Schmidt
;
Christian Schmidt
(Conceptualization, Data curation, Formal analysis, Writing – review & editing)
3
GFZ German Research Center for Geosciences
, Telegrafenberg D324, 14473 Potsdam, Germany
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Richard Wirth;
Richard Wirth
(Formal analysis, Writing – review & editing)
3
GFZ German Research Center for Geosciences
, Telegrafenberg D324, 14473 Potsdam, Germany
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Yaakov Weiss
;
Yaakov Weiss
(Conceptualization, Writing – review & editing)
2
The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University
, Jerusalem 91904, Israel
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Yael Kempe
;
Yael Kempe
(Conceptualization, Writing – review & editing)
2
The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University
, Jerusalem 91904, Israel
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Sergei Remennik
;
Sergei Remennik
(Data curation, Formal analysis, Writing – review & editing)
4
The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, The Safra Campus
, 9190401 Jerusalem, Israel
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Wenjun Liu
;
Wenjun Liu
(Data curation, Formal analysis, Writing – review & editing)
5
Argonne National Laboratory, Advanced Photon Source
, Lemont, Illinois 60439, USA
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Stella Chariton
;
Stella Chariton
(Data curation, Formal analysis, Writing – review & editing)
6
University of Chicago, GeoSoilEnviroCARS, Advanced Photon Source
, Lemont, Illinois 60439, USA
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Vitali B. Prakapenka
Vitali B. Prakapenka
(Data curation, Formal analysis, Writing – review & editing)
6
University of Chicago, GeoSoilEnviroCARS, Advanced Photon Source
, Lemont, Illinois 60439, USA
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a)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 161, 204506 (2024)
Article history
Received:
May 15 2024
Accepted:
November 08 2024
Citation
Oliver Tschauner, Oded Navon, Christian Schmidt, Richard Wirth, Yaakov Weiss, Yael Kempe, Sergei Remennik, Wenjun Liu, Stella Chariton, Vitali B. Prakapenka; Long-term relaxation of orientational disorder and structural modifications in molecular nitrogen at high pressure. J. Chem. Phys. 28 November 2024; 161 (20): 204506. https://doi.org/10.1063/5.0219186
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