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
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 im...
| Autores: | ; ; ; ; |
|---|---|
| Tipo de documento: | Artigo |
| Estado: | Published version |
| Data de publicação: | 2017 |
| País: | Argentina |
| Recursos: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositório: | CONICET Digital (CONICET) |
| Idioma: | Inglês |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/44191 |
| Acesso em linha: | http://hdl.handle.net/11336/44191 |
| Nível de acesso: | Acesso aberto |
| Palavra-chave: | Cobaltites Crystal Structure Stability Nb-Doping Oxide Mixed Conductors Perovskites Thermal Expansion, Impedance Spectroscopy https://purl.org/becyt/ford/2.5 https://purl.org/becyt/ford/2 |
| _version_ | 1878402916295901184 |
|---|---|
| author | Setevich, C |
| author2 | Toscani, Lucía María Larrondo, Susana Adelina Prado, F. Caneiro, A |
| author2_role | author author author author |
| author_browse | Caneiro, A Larrondo, Susana Adelina Prado, F. Setevich, C Toscani, Lucía María |
| author_facet | Setevich, C Toscani, Lucía María Larrondo, Susana Adelina Prado, F. Caneiro, A |
| author_role | author |
| collection | CONICET Digital (CONICET) |
| description | 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. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | AR_1aafffa74c7ad2c29e71ed488b4b4ce9 |
| identifier_str_mv | 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 0167-2738 CONICET Digital CONICET |
| institution | Consejo Nacional de Investigaciones Científicas y Técnicas |
| instname_str | Consejo Nacional de Investigaciones Científicas y Técnicas |
| language | eng |
| network_acronym_str | AR |
| network_name_str | Argentina |
| oai_identifier_str | oai:ri.conicet.gov.ar:11336/44191 |
| publishDate | 2017 |
| publishDateSort | 2017 |
| publisher | Elsevier Science |
| publisherStr | Elsevier Science |
| reponame_str | CONICET Digital (CONICET) |
| spelling | 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 Setevich, C Toscani, Lucía María Larrondo, Susana Adelina Prado, F. Caneiro, A Cobaltites Crystal Structure Stability Nb-Doping Oxide Mixed Conductors Perovskites Thermal Expansion, Impedance Spectroscopy https://purl.org/becyt/ford/2.5 https://purl.org/becyt/ford/2 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. Fil: Setevich, C. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Sur. Departamento de Física; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina Fil: Toscani, Lucía María. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina Fil: Larrondo, Susana Adelina. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina. Universidad Nacional de San Martín; Argentina Fil: Prado, F.. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Sur. Departamento de Física; Argentina Fil: Caneiro, A. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina Elsevier Science http://hdl.handle.net/11336/44191 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 0167-2738 CONICET Digital CONICET |
| spellingShingle | 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 Setevich, C Cobaltites Crystal Structure Stability Nb-Doping Oxide Mixed Conductors Perovskites Thermal Expansion, Impedance Spectroscopy https://purl.org/becyt/ford/2.5 https://purl.org/becyt/ford/2 |
| status_str | publishedVersion |
| 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | Cobaltites Crystal Structure Stability Nb-Doping Oxide Mixed Conductors Perovskites Thermal Expansion, Impedance Spectroscopy https://purl.org/becyt/ford/2.5 https://purl.org/becyt/ford/2 |
| topic_facet | Cobaltites Crystal Structure Stability Nb-Doping Oxide Mixed Conductors Perovskites Thermal Expansion, Impedance Spectroscopy https://purl.org/becyt/ford/2.5 https://purl.org/becyt/ford/2 |
| url | http://hdl.handle.net/11336/44191 |