dc.creator | Setevich, C | |
dc.creator | Toscani, Lucía María | |
dc.creator | Larrondo, Susana Adelina | |
dc.creator | Prado, F. | |
dc.creator | Caneiro, A | |
dc.date.accessioned | 2018-05-04T18:37:49Z | |
dc.date.available | 2018-05-04T18:37:49Z | |
dc.date.created | 2018-05-04T18:37:49Z | |
dc.date.issued | 2017-02 | |
dc.identifier | Setevich, C; Toscani, Lucía María; Larrondo, Susana Adelina; Prado, F.; Caneiro, A; Effect of Nb5 + content on the high temperature properties of the mixed conductors system La1 − xBaxCo1 − yNbyO3 − δ with 0.6 ≤ x ≤ 1.0 and 0 ≤ y ≤ 0.4; Elsevier Science; Solid State Ionics; 300; 2-2017; 140-148 | |
dc.identifier | 0167-2738 | |
dc.identifier | http://hdl.handle.net/11336/44191 | |
dc.identifier | CONICET Digital | |
dc.identifier | CONICET | |
dc.description.abstract | The replacement of Co by Nb in the La1 − xBaxCo1 − yNbyO3 − δ (0.6 ≤ x ≤ 1.0) system and its effects on phase stability and high temperature properties of the cubic perovskite phase were investigated by X-ray diffraction, dilatometry, electrical conductivity, oxygen permeation and electrochemical impedance spectroscopy. The incorporation of Nb in the B site stabilizes the cubic perovskite in the as prepared samples. The Nb solubility increases from y = 0.1, for the sample with Ba content x = 0.6, to y = 0.4 for 0.8 ≤ x ≤ 1.0. However, after a heat treatment at 750 °C during 10 days small amounts of secondary phases were detected for samples with x = 0.9 and 1.0. The linear expansion of the cubic phases decreases with the Nb content as well as with the Ba content. The minimum value, α = 12.9 × 10− 6 K− 1, was obtained for La0.2Ba0.8Co0.6Nb0.4O3 − δ. The behavior of electrical conductivity and oxygen permeation data with Nb content is explained from variations in the oxygen vacancy concentration, which is controlled by Nb5 + and Ba2 + contents. The minimum polarization resistance value, Rp = 0.08 Ω cm2, was obtained at 600 °C for La0.2Ba0.8Co0.9Nb0.1O3 − δ. The low Rp value of this compound and the crystal structure stability of various compositions in the system La1 − xBaxCo1 − yNbyO3 − δ with x ≥ 0.7 and y ≥ 0.1 make these materials of interest as mixed conductors. | |
dc.language | eng | |
dc.publisher | Elsevier Science | |
dc.relation | info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.ssi.2016.12.016 | |
dc.relation | info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0167273816306919 | |
dc.rights | https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ | |
dc.rights | info:eu-repo/semantics/restrictedAccess | |
dc.subject | Cobaltites | |
dc.subject | Crystal Structure Stability | |
dc.subject | Nb-Doping | |
dc.subject | Oxide Mixed Conductors | |
dc.subject | Perovskites | |
dc.subject | Thermal Expansion, Impedance Spectroscopy | |
dc.title | Effect of Nb5 + content on the high temperature properties of the mixed conductors system La1 − xBaxCo1 − yNbyO3 − δ with 0.6 ≤ x ≤ 1.0 and 0 ≤ y ≤ 0.4 | |
dc.type | info:eu-repo/semantics/article | |
dc.type | info:ar-repo/semantics/artículo | |
dc.type | info:eu-repo/semantics/publishedVersion | |