Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1298761 | Solid State Ionics | 2008 | 4 Pages |
Abstract
High-temperature X-ray diffraction revealed peculiarities of thermal expansion of Sr3YCo4O10.5 with tetragonal 314-structure such as anisotropy of the lattice expansion (thermal expansion coefficient of the a-parameter TECav(a) = 18.6 ppm Kâ 1, TEC(c) = 25.6 ppm Kâ 1) and two intermediate regions with different TEC anisotropy: TEC(c)/TEC(a) = 1.98 at 298-773 K and 0.96 at 773-1173 K. Replacement of Co by Fe in Sr3YCo4 â xFexO10.5 + y leads to decreasing of TEC at T < 673 K to 16.6 ppm Kâ 1 for x = 1.0 and 14.6 ppm Kâ 1 for x = 3.0. At T > 673 K increase of TEC up to â¼Â 20 ppm Kâ 1 due to the oxygen loss from the crystal structure is observed. Sr3YCo4 â xFexO10.5 + y compounds show high electrical conductivity values at 1173 K up to â¼Â 200 S/cm for Sr3YCo4O10.5. A decrease in conductivity at high temperature is observed with increasing the Fe-content.
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Authors
S.Ya. Istomin, O.A. Drozhzhin, Ph.S. Napolsky, S.N. Putilin, A.A. Gippius, E.V. Antipov,