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Journal Article

Long-term relaxation of orientational disorder and structural modifications in molecular nitrogen at high pressure

Authors

Tschauner,  Oliver
External Organizations;

Navon,  Oded
External Organizations;

/persons/resource/hokie

Schmidt,  C.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/wirth

Wirth,  R.
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Weiss,  Yaakov
External Organizations;

Kempe,  Yael
External Organizations;

Remennik,  Sergei
External Organizations;

Liu,  Wenjun
External Organizations;

Chariton,  Stella
External Organizations;

Prakapenka,  Vitali B.
External Organizations;

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Citation

Tschauner, O., Navon, O., Schmidt, C., Wirth, R., Weiss, Y., Kempe, Y., Remennik, S., Liu, W., Chariton, S., Prakapenka, V. B. (2024): Long-term relaxation of orientational disorder and structural modifications in molecular nitrogen at high pressure. - Journal of Chemical Physics, 161, 204506.
https://doi.org/10.1063/5.0219186


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5029663
Abstract
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.