High pressure metallization and amorphization of the molecular crystal Sn(IBr){sub 2}
- Tel-Aviv Univ. (Israel). School of Physics and Astronomy
- Los Alamos National Lab., NM (United States)
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.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 304019
- Report Number(s):
- LA-UR-98-2270; CONF-980951-; ON: DE99001080; TRN: AHC29904%%93
- Resource Relation:
- Conference: 36. European High Pressure Research Group on molecular and low dimensional systems under pressure, Catania (Italy), 7-11 Sep 1998; Other Information: PBD: [1998]
- Country of Publication:
- United States
- Language:
- English
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