Journal article
Two- and three-dimensional extended solids and metallization of compressed XeF2
Nature chemistry, Vol.2(9), pp.784-788
09/2010
Handle:
https://hdl.handle.net/2376/107601
PMID: 20729901
Abstract
The application of pressure, internal or external, transforms molecular solids into extended solids with more itinerant electrons to soften repulsive interatomic interactions in a tight space. Examples include insulator-to-metal transitions in O(2), Xe and I(2), as well as molecular-to-non-molecular transitions in CO(2) and N(2). Here, we present new discoveries of novel two- and three-dimensional extended non-molecular phases of solid XeF(2) and their metallization. At approximately 50 GPa, the transparent linear insulating XeF(2) transforms into a reddish two-dimensional graphite-like hexagonal layered structure of semiconducting XeF(4). Above 70 GPa, it further transforms into a black three-dimensional fluorite-like structure of the first observed metallic XeF(8) polyhedron. These simultaneously occurring molecular-to-non-molecular and insulator-to-metal transitions of XeF(2) arise from the pressure-induced delocalization of non-bonded lone-pair electrons to sp(3)d(2) hybridization in two-dimensional XeF(4) and to p(3)d(5) in three-dimensional XeF(8) through the chemical bonding of all eight valence electrons in Xe and, thereby, fulfilling the octet rule at high pressures.
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Details
- Title
- Two- and three-dimensional extended solids and metallization of compressed XeF2
- Creators
- Minseob Kim - Institute for Shock Physics and Department of Chemistry, Washington State University, Pullman, Washington 99164, USAMathew DebessaiChoong-Shik Yoo
- Publication Details
- Nature chemistry, Vol.2(9), pp.784-788
- Academic Unit
- Institute for Shock Physics
- Publisher
- England
- Identifiers
- 99900547237301842
- Language
- English
- Resource Type
- Journal article