| Author(s): |
Jason D. Pless; Terry J. Garino; James E. Maslar; Tina M. Nenoff; |
| Title: |
Tunable Ionic-Conductivity of Collapsed Sandia Octahedral Molecular Sieves (SOMS) |
| Published: |
September 12, 2007 |
| 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, Na4Nb4-2xM2xO12-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 (NaNb1-2xM2xO3-x, where 0 = x = 0.1). Furthermore, we are able to show improved of ion conductivity over YSZ 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. |
| Citation: |
Chemistry of Materials |
| Volume: |
19 |
| Issue: |
20 |
| Pages: |
pp. 4855 - 4863 |
| Keywords: |
ionic conductivity;perovskites;SOMS |
| Research Areas: |
Ceramics, Structures, Materials Science, Properties |
| PDF version: |
 Click here to retrieve PDF version of paper (261KB) |
