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Ion Transport in Beta-Gallia Rutile Intergrowths Doreen Edwards, Alfred University, DMR-0093690

Investigating ion exchange in Beta-Gallia Rutile materials and their applications in electrochemical devices. Research focuses on Na+ analog. Impedance spectroscopy and X-ray diffraction used for process understanding. Education and Outreach with graduate and undergraduate students.

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Ion Transport in Beta-Gallia Rutile Intergrowths Doreen Edwards, Alfred University, DMR-0093690

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  1. Ion Transport in Beta-Gallia Rutile IntergrowthsDoreen Edwards, Alfred University, DMR-0093690 LiGa5O8 GaO1.5 LiO0.5 TiO2 LixGa4+xTi1-xO8 TiO2 NaO0.5 Na0.7Ga4.7Ti0.3O8 NaO0.5 TiO2 GaO1.5 NaxGa4+xTi2-xO10 NaxGa4+xTi1-xO8 K2.56 Ga22O34.28 K0.8Ga4.8Ti2.2O12 KO0.5 GaO1.5 KxGa4+xTi1-xO8 A0.7Ga4.7Ti0.3O8 Beta-gallia-rutile (BGR) intergrowths are interesting materials because they possess small 1-D tunnels that are suitable hosts for small-to-medium sized cations. This type of host-guest architecture is often found in materials for electrochemical devices such as batteries, fuel cells, and sensors. Currently, we are focusing on one specific BGR-related structure, A0.7Ga4.7Ti0.3O8, where A is a monovalent cation like H+, Li+ Na+, or K+. We have found that only the Na+ analog can be formed by solid-state reaction and have developed a variety of solution- based methods for exchanging Na+ with other species. Impedance spectroscopy and X-ray diffraction are being used to understand the exchange process. Empty tunnel Alkali cation

  2. Ion Transport in Beta-Gallia Rutile IntergrowthsDoreen Edwards, Alfred University, DMR-0093690 Education and Outreach: Three graduate students and two undergraduate students are currently involved in this project. Jake Amoroso is a second-year Ph.D. student investigating ion exchange in BGR materials. He was the co-author of one manuscript published in Solid State Ionics. Nathan Empie is a fourth year Ph.D. student investigating DNA attachment to BGR surfaces. He is the primary author of four manuscripts; one published in Solid State Ionics, one in Langmuir, and two under review. Stephen Sanford is a first year M.S. student investigating the photocatalytic activity of BGRs and other tunneled titanates. He is currently preparing a manuscript for publication. Graduate student Jake Amoroso (above) demonstrated some of the interesting properties of glass and ceramic materials to high-school juniors during a tour of Alfred University’s campus.

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