High pressure /sup 129/I Moessbauer studies of GeI/sub 4/ molecular crystals

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The Moessbauer effect in /sup 129/I in conjunction with Diamond-Anvil-Cell high pressure techniques was applied to investigate the high pressure phase(s) of the molecular crystal GeI/sub 4/. The /sup 129/I Quadrupole Interaction was the main probe for characterizing the intermolecular structural transformation with pressure. With increasing pressure, at about 15 GPAa, the onset of a partial molecular-association phase (HP1) is first observed. In HP1 two out of the four iodines strongly overlap to form linear chains of GeI/sub 4/. The HP1 phase coexists with the low pressure (LP) molecular phase, but its population increases with increasing pressure. At P /approx/20 ... continued below

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Pages: 12

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Pasternak, M.P. & Taylor, R.D. January 1, 1989.

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Description

The Moessbauer effect in /sup 129/I in conjunction with Diamond-Anvil-Cell high pressure techniques was applied to investigate the high pressure phase(s) of the molecular crystal GeI/sub 4/. The /sup 129/I Quadrupole Interaction was the main probe for characterizing the intermolecular structural transformation with pressure. With increasing pressure, at about 15 GPAa, the onset of a partial molecular-association phase (HP1) is first observed. In HP1 two out of the four iodines strongly overlap to form linear chains of GeI/sub 4/. The HP1 phase coexists with the low pressure (LP) molecular phase, but its population increases with increasing pressure. At P /approx/20 GPa a second high pressure phase (HP2) is identified where all four iodines strongly overlap to form a three dimensional, fully molecular-associated structure. With increasing pressure and at P > 20 GPa, HP2 is the only phase up to P = 34 GPa, the highest pressure used. A significant hysteresis of the relative abundances with pressure is observed. The isomer shift of the HP2 and HP1 structures is considerably larger than that of the LP one. 11 refs., 3 figs.

Physical Description

Pages: 12

Notes

NTIS, PC A03/MF A01; OSTI; INIS; GPO Dep.; 1.

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  • International conference on the applications of the Mossbauer effect (ICAME '89), Budapest, Hungary, 4-8 Sep 1989

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  • Other: DE89015269
  • Report No.: LA-UR-89-2324
  • Report No.: CONF-890933-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5627325
  • Archival Resource Key: ark:/67531/metadc1092313

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1989

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  • Feb. 10, 2018, 10:06 p.m.

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  • March 28, 2018, 1:14 p.m.

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Pasternak, M.P. & Taylor, R.D. High pressure /sup 129/I Moessbauer studies of GeI/sub 4/ molecular crystals, article, January 1, 1989; United States. (digital.library.unt.edu/ark:/67531/metadc1092313/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.