Matthew J Beck

Publications (1)7.37 Total impact

• Source

  Available from: Maria Varela

  Article: Origin of colossal ionic conductivity in oxide multilayers: interface induced sublattice disorder.

  Timothy J Pennycook, Matthew J Beck, Kalman Varga, Maria Varela, Stephen J Pennycook, Sokrates T Pantelides
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  ABSTRACT: Oxide ionic conductors typically operate at high temperatures, which limits their usefulness. Colossal room-temperature ionic conductivity was recently discovered in multilayers of yttria-stabilized zirconia (YSZ) and SrTiO3. Here we report density-functional calculations that trace the origin of the effect to a combination of lattice-mismatch strain and O-sublattice incompatibility. Strain alone in bulk YSZ enhances O mobility at high temperatures by inducing extreme O disorder. In multilayer structures, O-sublattice incompatibility causes the same extreme disorder at room temperature.
  Physical Review Letters 03/2010; 104(11):115901. · 7.37 Impact Factor