Ion Transport in Beta-Gallia Rutile Intergrowths Doreen Edwards, Alfred University, DMR-0093690 A0.7Ga4.7Ti0.3O8 Beta-gallia-rutile (BGR) intergrowths.

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Presentation transcript:

Ion Transport in Beta-Gallia Rutile Intergrowths Doreen Edwards, Alfred University, DMR-0093690 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 TiO2 LiGa5O8 GaO1.5 LiO0.5 LixGa4+xTi1-xO8 NaxGa4+xTi1-xO8 NaO0.5 Na0.7Ga4.7Ti0.3O8 NaxGa4+xTi2-xO10 TiO2 KxGa4+xTi1-xO8 GaO1.5 KO0.5 K0.8Ga4.8Ti2.2O12 K2.56 Ga22O34.28

Ion Transport in Beta-Gallia Rutile Intergrowths Doreen 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.