Hutchison Hall, Rochester, NY

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Join us to hear from James Walsh about his research at UMass Amherst!

The ability to study matter under extreme pressures and temperatures has opened up a vast new playground for solid-state chemists to explore. Gone are the days when elemental systems are partitioned into those that form compounds and those that do not. Instead, a new question has taken hold: under what conditions do these systems form stable phases, and can these new phases be recovered for further study and integration into technology? For materials scientists, extreme pressure represents a treasure trove of exotic compounds awaiting discovery—new materials that could propel next-generation or even as-yet unimagined technologies.

In this talk, University of Massachusetts Amherst's James Walsh will describe some of the novel methods being developed in his lab that will empower solid-state chemists with the tools they need to precisely target and recover high-pressure phases. In particular, he will share some of his lab's recent results on the discovery of novel mid-row transition metal carbides, demonstrating how their methods allow them to carry out the highly selective synthesis of high-pressure phases up to extreme pressures. He will show how in situ X-ray diffraction can be used to solve and characterize new crystal structures within the diamond anvil cell. He will also discuss how his studies are deeply integrated with powerful crystal structure prediction methods, and how his results uncover opportunities for improving these methods. For the novel phases that can be recovered to ambient pressures, he will share results on how large volume high-pressure synthesis methods can be used to grow large single crystals that unlock their further bulk characterization.

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