Abstract Submitted for the MAR11 Meeting of The American Physical Society Origin of colossal ionic conductivity in YSZ/STO multilayers
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Submitted for the MAR11 Meeting of The American Physical Society Origin of colossal ionic conductivity in YSZ/STO multilayers TIMOTHY PENNYCOOK, MARK OXLEY, Vanderbilt Univ., Oak Ridge National Laboratory, MATTHEW BECK, Vanderbilt Univ., JAVIER GARCIABARRIOCANAL, FLAVIO BRUNO, CARLOS LEON, JACOBO SANTAMARIA, Complutense Univ., Madrid, MARIA VARELA, Oak Ridge National Laboratory, STEPHEN PENNYCOOK, Oak Ridge National Laboratory, Vanderbilt Univ., SOKRATES PANTELIDES, Vanderbilt Univ., Oak Ridge National Laboratory — A colossal eight order of magnitude increase in the ionic conductivity of yttriastabilized zirconia (YSZ) near room temperature was recently reported in YSZ/strontium titanate (STO) epitaxial heterostructures [1]. We present density functional theory results that explain the enhancement in terms of strainand interface-induced disorder of the YSZ O-sublattice [2]. We further present experimental confirmation of O disorder using a combination of scanning transmission electron microscopy and electron energy loss spectroscopy. The O K-edge fine structure shows blurred-out features indicative of disorder [3]. Atomic-resolution elemental mapping clearly resolves the O sublattice in the STO but is blurred out in the YSZ, indicating disorder. This work is supported by DOE grant DE-FG02-09ER46554 and DOE Materials Sciences and Engineering Div. 1 J. Garcia-Barriocanal et al. Science 321, 676 (2008); 2 T.J. Pennycook et al., Phys. Rev. Lett. 104, 115901 (2010); 3 T.J. Pennycook et al., European Phys. J. Timothy Pennycook Vanderbilt Univ., Oak Ridge National Laboratory Date submitted: 17 Nov 2010 Electronic form version 1.4
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