|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Materials for Energy Conversion and Storage
||Increasing Ionic Conductivity with Highly Ionizing Radiation
||Jacob Shamblin, Cameron L. Tracy, Rodney C. Ewing, Joshua Sangoro, Caitlin Taylor, Maulik Patel, William J. Weber, Raul Palomares, Eric O'Quinn, Maik Lang
|On-Site Speaker (Planned)
Many complex oxides exhibiting the pyrochlore structure display ionic conductivity on the order of yttria-stabilized zirconia and thus find use as potential electrolytes in solid oxide fuel cells. Here we present a new strategy for further increasing ionic conductivity through irradiation with heavy ions of high specific energy (> 5 MeV/u). Select pyrochlore compositions (e.g., Gd2Ti2O7, Gd2Zr2O7 and Er2Ti2O7) have been irradiated at the GSI Helmholtz Center for Heavy Ion Research in Darmstadt, Germany. Radiation-induced phase transformations include amorphization, disordering to a fluorite-type phase, and a combination of the two. Broadband dielectric spectroscopy measurements reveal that ionic conductivity in these far-from-equilibrium phases (which are stable up to about 800 C) is in some cases increased by a factor of 250 compared with the ordered pyrochlore phase prior to irradiation. This increase is due to enhanced mobility in the irradiated phases as well as an increased defect concentration.
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