Synthesis of Non-molecular Nitrogen Phases at Mbar Pressures by Direct Laser-heating

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Direct laser heating of molecular N2 to above 1400 K at 120-130 GPa results in the formation of a reddish amorphous phase and a transparent crystalline solid above 2000 K. Raman and x-ray data confirm that the transparent phase is cubic-gauche nitrogen (cg-N), while the reddish color of the amorphous phase might indicate the presence of N=N dish bonds. The quenched amorphous phase is stable down to at least 70GPa, analogous to cg-N, and could be a new non-molecular phase or an extension of the already known {eta}-phase. A chemo-physical phase diagram is presented which emphasizes the difference between pressure- ... continued below

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PDF-file: 19 pages; size: 3.2 Mbytes

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Lipp, M J; Klepeis, J P; Baer, B J; Cynn, H; Evans, W J; Iota, V et al. March 26, 2007.

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Direct laser heating of molecular N2 to above 1400 K at 120-130 GPa results in the formation of a reddish amorphous phase and a transparent crystalline solid above 2000 K. Raman and x-ray data confirm that the transparent phase is cubic-gauche nitrogen (cg-N), while the reddish color of the amorphous phase might indicate the presence of N=N dish bonds. The quenched amorphous phase is stable down to at least 70GPa, analogous to cg-N, and could be a new non-molecular phase or an extension of the already known {eta}-phase. A chemo-physical phase diagram is presented which emphasizes the difference between pressure- and temperature-induced transitions from molecular to non-molecular solids, as found in other low Z systems.

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PDF-file: 19 pages; size: 3.2 Mbytes

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  • Journal Name: Physical Review B, vol. 76, no. 1, July 19, 2007, pp. 014113; Journal Volume: 76; Journal Issue: 1

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  • Report No.: UCRL-JRNL-229589
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 919617
  • Archival Resource Key: ark:/67531/metadc896277

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  • March 26, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 8, 2016, 11:22 p.m.

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Lipp, M J; Klepeis, J P; Baer, B J; Cynn, H; Evans, W J; Iota, V et al. Synthesis of Non-molecular Nitrogen Phases at Mbar Pressures by Direct Laser-heating, article, March 26, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc896277/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.