Dr John S. McCloy is Professor and current Director of the School of Mechanical & Materials Engineering and Lindholm Endowed Chair in Materials Engineering at Washington State University (WSU) in Pullman, WA. His professional career includes stints in industry (10 y), national laboratory (5 y), and academia (10+ y) sectors. He retains a joint appointment as Chief Scientist at Pacific Northwest National Laboratory. At WSU, he leads the Nuclear, Optical, Magnetic, & Electronic (NOME) Materials Lab and the Crystals and SemiConductors (CASC) group, both within the Institute of Materials Research (IMR). Together these scientists and engineers develop materials solutions for energy, environment, and security applications. He holds a BS in Materials Science & Engineering (MSE) from the Massachusetts Institute of Technology and PhD in MSE from the University of Arizona.

Structure and chemistry of volatile anions in crystals glasses, & melts: sulfate, fluoride, chloride

Many anions in silicate melts tend to be volatile, and thus the structural incorporation in glasses and comparison crystals is useful for predicting effects on physical properties. In this talk, sulfate, fluoride, and chloride anions will be discussed through a study of 1) the structure in pure ionic glasses and as additives to oxide glasses, 2) the structure in molten salt liquids, 3) crystallization in multicomponent melts and glasses, and 4) insight from mineralogy and crystal chemistry. Understanding and predicting these structures in glasses and liquids gives insight into potential crystallization evolution. Systems evaluated include those involving only sulfate, fluoride, or chloride as well as some with multiple anions. The application to materials of interest in several fields of study are given, including optics, volcanology, molten salt utilization, nuclear waste vitrification, and semiconductor processing.