title: Pressure-induced Transformations of Dense Carbonyl Sulfide to Singly Bonded Amorphous Metallic Solid.
abstract: The application of pressure, internal or external, transforms molecular solids into non-molecular extended network solids with diverse crystal structures and electronic properties. These transformations can be understood in terms of pressure-induced electron delocalization; however, the governing mechanisms are complex because of strong lattice strains, phase metastability and path dependent phase behaviors. Here, we present the pressure-induced transformations of linear OCS (R3m, Phase I) to bent OCS (Cm, Phase II) at 9 GPa; an amorphous, one-dimensional (1D) polymer at 20 GPa (Phase III); and an extended 3D network above ~35 GPa (Phase IV) that metallizes at ~105 GPa. These results underscore the significance of long-range dipole interactions in dense OCS, leading to an extended molecular alloy that can be considered a chemical intermediate of its two end members, CO2 and CS2.
authors.affiliation: Institute for Shock Physics, Department of Physics, and Department of Chemistry, Washington State University, Pullman, Washington 99164, USA.
authors.forename: Minseob
authors.initials: M
authors.lastname: Kim
authors.affiliation: Institute for Shock Physics, Department of Physics, and Department of Chemistry, Washington State University, Pullman, Washington 99164, USA.
authors.forename: Ranga
authors.initials: R
authors.lastname: Dias
authors.affiliation: Japan Synchrotron Radiation Research Institute, Koto 1-1-1, Sayo, Hyogo 679-5198, Japan.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Ohishi
authors.affiliation: Department of Electrical, Electronic and Computer Engineering, Gifu University 1-1 Yanagido, Gifu 501-1193, Japan.
authors.forename: Takehiro
authors.initials: T
authors.lastname: Matsuoka
authors.affiliation: Institute for Shock Physics, Department of Physics, and Department of Chemistry, Washington State University, Pullman, Washington 99164, USA.
authors.forename: Jing-Yin
authors.initials: JY
authors.lastname: Chen
authors.affiliation: Institute for Shock Physics, Department of Physics, and Department of Chemistry, Washington State University, Pullman, Washington 99164, USA.
authors.forename: Choong-Shik
authors.initials: CS
authors.lastname: Yoo