High pressure metallization and amorphization of the molecular crystal Sn(IBr){sub 2}

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An insulator-to-metal transition concurring with amorphization is found in the cubic (Pa{bar 3}) molecular crystal Sn(IBr){sub 2} at P {approx} 20 GPa. Measurements were carried out with diamond-anvil cells at pressures up to {approximately}30 GPa using resistance measurements, X-ray diffraction (XRD), and {sup 119}Sn Moessbauer spectroscopy (MS). With increasing pressure a new crystalline phase is observed in the 10--23 GPa range; at P {approx} 16 GPa a gradual onset of structural disorder is first observed, and full amorphization takes place at P {ge} 21 GPa. Both electronic properties as measured by R(P,T) and MS data are consistent with a gradual ... continued below

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10 p.

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Machavariani, G.Y.; Rozenberg, G.K.; Pasternak, M.P.; Naaman, O. & Taylor, R.D. December 31, 1998.

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Description

An insulator-to-metal transition concurring with amorphization is found in the cubic (Pa{bar 3}) molecular crystal Sn(IBr){sub 2} at P {approx} 20 GPa. Measurements were carried out with diamond-anvil cells at pressures up to {approximately}30 GPa using resistance measurements, X-ray diffraction (XRD), and {sup 119}Sn Moessbauer spectroscopy (MS). With increasing pressure a new crystalline phase is observed in the 10--23 GPa range; at P {approx} 16 GPa a gradual onset of structural disorder is first observed, and full amorphization takes place at P {ge} 21 GPa. Both electronic properties as measured by R(P,T) and MS data are consistent with a gradual growth of disordered (SnI{sub 2}Br{sub 2}){sub n} polymeric chains, formed by intermolecular I{single_bond}I bonding allowing for electronic delocalization to occur. Upon decompression both XRD and {sup 119}Sn MS show a significant pressure hysteresis.

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10 p.

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OSTI as DE99001080

Source

  • 36. European High Pressure Research Group on molecular and low dimensional systems under pressure, Catania (Italy), 7-11 Sep 1998

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  • Other: DE99001080
  • Report No.: LA-UR--98-2270
  • Report No.: CONF-980951--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/304019 | External Link
  • Office of Scientific & Technical Information Report Number: 304019
  • Archival Resource Key: ark:/67531/metadc676343

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 29, 2016, 9:21 p.m.

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Machavariani, G.Y.; Rozenberg, G.K.; Pasternak, M.P.; Naaman, O. & Taylor, R.D. High pressure metallization and amorphization of the molecular crystal Sn(IBr){sub 2}, report, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc676343/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.