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DTSTART;TZID="Pacific Time (US & Canada)":20251121T161000
DTEND;TZID="Pacific Time (US & Canada)":20251121T170000
SUMMARY:PChem Seminar – Shinhyo Bang
LOCATION:Fulmer Hall
DESCRIPTION:Speaker: Shinhyo Bang\n\nGroup: Dr. Xiaofeng Guo\n\nTitle: Thermodynamics of Actinide-Bearing Zircon\n\nAbstract:\n\nThe thermodynamics of zircon-structured silicates are profoundly influenced by both impurity incorporation and external pressure.\n\nIn the first part of this talk, I will present an empirical model describing the pressure-induced phase transition in a mixed actinide system (uranothorite), emphasizing the pivotal role of mixing enthalpy in controlling phase stability.\n\nIn the second part, I will discuss our recent investigation into the solubility limit of uranium in zircon (chernobylite), explaining why chernobylite cannot be synthesized beyond a certain uranium concentration. This limitation can be empirically rationalized by considering the mixing behavior of U and Zr polyhedra.\n\nFar from being an abstract construct, the polyhedron serves as a fundamental unit in crystal chemistry, one that captures the structural and energetic essence of a material. I will conclude by extending this polyhedral perspective to uranium-doped yttrium aluminum garnet (YAG), demonstrating its broader relevance for understanding defect accommodation and stability in complex oxide systems.
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