(September 10th, 2019)

Dr. Darryl P. Butt, of the University of Utah, will be our guest speaker at the upcoming graduate seminar. He will be speaking at 4:00pm in 256 CB

About our speaker: 

Prof. Darryl Butt is Dean of the College of Mines and Earth Sciences and Director of the DOE BES Energy Frontier Research Center, MUSE at the University of Utah.  He has a PhD in the field of materials science and engineering from Penn State University, and has approximately 30 years of leadership and research experience in academia, industry, and at two national laboratories.

The author or co-author of approximately 220 publications, his research activities and interests are diverse including development of materials for extreme environments and energy applications, membrane technologies for gas separation, technical issues associated with nuclear non-proliferation and international security, chemical and engineering solutions to carbon dioxide emissions including early work on sequestration, and materials issues associated with art and cultural heritage.  

Abstract: 

Using a combination of ab initio modeling, x-ray and neutron diffraction, dilatometry, electron microscopy, magnetometry, and thermal analysis methods, the stability, phase relations, micro- and nano-scale structures of LaxA1-xFeO3-y were assessed, with emphasis on understanding the effects of divalent cation substitutions and temperature on nano-scale structure and properties.  Rietveld refinement and diffraction methods were used to assess atomic positions of atoms and vacancies in order to characterize the mechanisms of the phase transformations.  These diverse tools and approaches are used to elucidate a pseudo-binary phase diagram that helped to explain cation solubility limits, new phase formation and phase separation, and order-disorder transformations.  More importantly, the phases are correlated with opportunities for using these materials for catalytic, ion transport and gas-liquid conversion energy applications.  These observations contributed to the development of a family of membrane materials suitable for separating oxygen from air for subsequent use in the production of membranes for producing syngas and liquid fuels.