| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Temperature Electrochemistry: An FMD Symposium Honoring Uday B. Pal
|
| Presentation Title |
Processing Contributions to the Conduction Variability of Sr2-xVMoO6-δ |
| Author(s) |
Julia A. Esakoff, David Driscoll, Stephen W. Sofie |
| On-Site Speaker (Planned) |
Julia A. Esakoff |
| Abstract Scope |
Mixed Ionic & Electronic conductors (MIEC) continue to appeal in solid oxide fuel cell applications to eliminate triple phase boundaries conducive of two-dimensional electroactive surfaces. The properties observed by Sr2-xVMoO6-δ (SVMO) double perovskites, where x = 0.05-0.2, are enticing with extraordinary electronic conductivity coupled with mechanisms for fostering oxygen ion conduction. SVMO synthesis employs Pechini Sol-gel methods; subsequent heat treatments form phase pure material enabling variation in A-site sub-stoichiometry, ultimately affecting electronic conductivity. Lattice charge neutrality constraints with varied A-site deficiencies are presumably met through oxygen vacancy formation and B-site multivalency which impact electronic conductivity and material densification. X-ray diffraction and Raman spectroscopy verified oxidized and reduced sub-stoichiometric SVMO presence. Thermogravimetric analysis illustrates reversibility contributing to these phenomena. Tuning of Pechini parameters improved density from 55% to 91% while the oxide exhibits a semi-conductor to metallic transition at 800C. Trends in electronic conduction according to processing conditions are reported. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Electronic Materials, Energy Conversion and Storage |