Abstract
The structure−property relationship between atomic cation substitution and bulk-scale conductivity in perovskites has been studied systematically. A series of Na−Nb perovskites has been synthesized via two methods, (1) ion exchange or (2) synthetic metal doping of microporous Sandia Octahedral Molecular Sieve (SOMS, Na2Nb2-xMxO6-x(OH)x·H2O, where 0 ≤ x ≤ 0.4) phases, followed by calcination to the perovskite phase. We show that the oxygen conductivity can be altered by substitution of the A- and B- site cations in the perovskite structure Na1-xAxNb1-yMyO3-d, where 0 ≤ x ≤ 0.1). Furthermore, we are able to show improved ion conductivity over that of yttria-stabilized zirconia with the Na0.9Mg0.1Nb0.8Ti0.2O3-y phase with our highest conductivity observed (0.176 S/cm) at 1173 K. These fundamental studies allow us to develop perovskites with optimal electric properties.
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