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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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.

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Pages: 12

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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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  • January 1, 1989

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  • Feb. 10, 2018, 10:06 p.m.

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  • May 31, 2018, 12:51 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; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1092313/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.