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| Content Provider | Springer Nature Link |
|---|---|
| Author | Gomes, Eduarda Mather, Glenn C. Figueiredo, Filipe M. Marques, Fernando M. B. |
| Copyright Year | 2009 |
| Abstract | A study of the influence of the substitution of Al for Ga in the ceramic processing and electrical properties of La0.95Sr0.05Ga0.90–x Al x Mg0.10O3–δ (0 ≤ x ≤ 0.3) solid electrolytes is presented. The materials retained orthorhombic symmetry over the entire substitution range, whereas a deviation from Vegard’s law for x > 0.20 suggested a maximum Al solubility of x = 0.20. Scanning electron microscopy analysis of ceramic samples revealed that grain growth was inhibited for x ≥ 0.2. This microstructural change was related to an apparent deterioration of mechanical properties, as suggested by room-temperature Vickers hardness measurements. Impedance spectroscopy revealed a significant degradation of the grain-boundary electrical properties for x ≥ 0.20, whereas the bulk conductivity was enhanced for 0.10 ≤ x ≤ 0.15. Oxygen-permeability measurements confirmed that the studied materials remain essentially pure ionic conductors. An ionic conductivity maximum of 0.047 S/cm at 700 °C was obtained for x = 0.10. The effect of aluminium in the grain-bulk ionic conductivity is discussed in terms of defect cluster models and assuming fast oxygen diffusion along domain walls. |
| Starting Page | 1041 |
| Ending Page | 1052 |
| Page Count | 12 |
| File Format | |
| ISSN | 00269247 |
| Journal | Monatshefte für Chemie - Chemical Monthly |
| Volume Number | 140 |
| Issue Number | 9 |
| e-ISSN | 14344475 |
| Language | English |
| Publisher | Springer Vienna |
| Publisher Date | 2009-03-27 |
| Publisher Place | Vienna |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Solid electrolytes Grain boundaries Impedance spectroscopy Oxides Electrochemistry Ceramics Chemistry/Food Science Organic Chemistry Inorganic Chemistry Analytical Chemistry Physical Chemistry Theoretical and Computational Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry |
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