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Article
New states of matter and chemistry at extreme pressures: Low-Z extended solid
High-pressure research, whether static or dynamic, provides “windows” to novel states, transformations, and properties of highly compressed extended states of light elemental solids that may comprise the inter...
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Article
Barochemistry to Multifunctional High Energy Density Solid: Extended Phases of N2, CO, and N2+CO at High Pressures
Many simple diatomic and triatomic molecules such as N2 and CO2 have the potential to form extended “polymeric” solids under extreme conditions, which can store a large sum of chemical energy in its three-dimensi...
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Article
Open AccessPressure-induced Transformations of Dense Carbonyl Sulfide to Singly Bonded Amorphous Metallic Solid
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...
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Article
Open AccessPhase Diagram and Transformations of Iron Pentacarbonyl to nm Layered Hematite and Carbon-Oxygen Polymer under Pressure
We present the phase diagram of Fe(CO)5, consisting of three molecular polymorphs (phase I, II and III) and an extended polymeric phase that can be recovered at ambient condition. The phase diagram indicates a li...
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Article
Dynamic Structural and Chemical Responses of Energetic Solids
Understanding the dynamic responses of energetic materials is central to evaluating the energetic and chemical performance as well as development of novel energetic solids. These include thermal, mechanical an...
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Article
Dynamic responses of reactive metallic structures under thermal and mechanical ignitions
We have studied dynamic thermo-mechano-chemical responses of reactive metallic systems, both in clouds of small oxygen-free particles (≈1-10 urn in diameter) produced by fracturing Zr-rich bulk metallic glass ...
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Article
Formation of Methane Hydrates from Super-compressed Water and Methane Mixtures
Understanding the high-pressure kinetics associated with the formation of methane hydrates is critical to the practical use of the most abundant energy resource on earth. In this study, we have studied, for th...
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Article
Two- and three-dimensional extended solids and metallization of compressed XeF2
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...
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Article
Electronic Phase Transitions in F-electron Metals at High Pressures: Synchrotron X-ray Spectroscopic Studies on GD to 100 GPa
Unusual phase transitions driven by electron correlation effects occur in many f-electron metals (lanthanides and actinides alike) from localized phases to itinerant phases at high pressures. The dramatic changes...
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Article
Six-fold coordinated carbon dioxide VI
Under standard conditions, carbon dioxide (CO2) is a simple molecular gas and an important atmospheric constituent, whereas silicon dioxide (SiO2) is a covalent solid, and one of the fundamental minerals of the p...
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Article
High-energy-density extended CO solid
Covalently bonded extended phases of molecular solids made of first- and second-row elements at high pressures are a new class of materials with advanced optical, mechanical and energetic properties. The exist...
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Article
Polymeric Carbon Dioxide
Synthesis of polymeric carbon dioxide has long been of interest to many chemists and materials scientists. Very recently we discovered the polymeric phase of carbon dioxide (called CO2-V) at high pressures and te...
