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Electrical conductivity and defect chemistry of Ba(x)Sr(1-x)CoyFe(1-y)O(3-delta) perovskites
| Author | Yang, Z.; Harvey, A. S.; Infortuna, A.; Schoonman, J.; Gauckler, L. J. | |
| Year | 2011 | |
| Type | Journal Article | |
| Journal | Journal of Solid State Electrochemistry | |
| Volume | 15 | |
| Issue | 2 | |
| Pages | 277-284 | |
| ISSN | 1432-8488 | |
| Accession Numer | WOS:000287526800010 | |
| Abstract | Bulk Ba(x)Sr(1-x)CoyFe(1-y)O(3-delta) compositions (BSCF) were synthesized by the solid-state reaction method. The electrical conductivity of ceramic bars was measured using a dc four-probe method as a function of temperature in air up to 970 A degrees C. All compositions showed thermally activated p-type semi-conductivity up to similar to 450 A degrees C and then a transition to metal-like conductivity. The small-polaron hopping p-type semi-conductivity depends on the oxygen nonstoichiometry, which increases with increasing temperature. Metal-like conductivity is attributed to the overlap of the transition metal d-electron orbitals with the oxygen p-orbitals. Strontium-rich compositions show higher conductivity. The Co/Fe ratio does not influence much the p-type semi-conduction. Iron-rich compositions revealed more metal-like conduction behavior. The degree of overlap between transition metal d-orbitals and oxygen p-orbitals depends on the Ba/Sr as well as on the Co/Fe ratios. | |
| Notes | Times Cited: 0 | |
| URL |
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| Record Number | 718 | |
| Group | nonmet |
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