Pressure induced amorphization of GeI[sub 4] molecular crystals

Journal Article · Mon Apr 25 04:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.2733· OSTI ID:7207452

Pasternak, M P; Taylor, R D; Kruger, M B; Jeanloz, R; Itie, J; Polian, A ^[1]

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1. School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv (Israel) Physics Division, P10, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) Department of Geology and Geophysics, University of California, Berkeley, California 94720 (United States) Physique des Milieux Condenses, Universite Pierre et Marie Curie, T 13 E 4, 4 place Jessieu, BP 77, F-75252 Paris Cedex 05 (France)

X-ray, Moessbauer spectroscopy, and extended x-ray absorption fine structure studies provide an atomic-scale description of the pressure-amorphized Ge[sub 4]. At [ital P][gt]12 GPa a gradual onset of structural disorder accompanied by a molecular-association process is observed. An amorphized state concurring with the transformation of the molecular crystal into a metallic glass stabilizes at 25 GPa. It is accomplished by a gradual growth of a disordered (GeI[sub 4])[sub [ital n]] polymer, a phase characterized by enhanced Ge-I bond lengths and charge delocalization. Both phenomena are consistent with a [ital I][sub 5[ital p]][r arrow]Ge[sub 4[ital s]4[ital p]] charge-transfer band closure.

• OSTI ID: 7207452
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:17; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
GERMANIUM COMPOUNDS
GERMANIUM IODIDES
HALIDES
HALOGEN COMPOUNDS
HYSTERESIS
IODIDES
IODINE COMPOUNDS
MOESSBAUER EFFECT
MOLECULAR STRUCTURE
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
POLYMERIZATION
PRESSURE DEPENDENCE
SCATTERING
SPECTROSCOPY
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY