| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
2024 Graduate Student Poster Contest
|
| Presentation Title |
SPG-25: Influence of Cation Bond Electronegativity on the Electrical and Structural Properties of Pyrochlore-Type Gd2Zr2-xSnxO7 Materials |
| Author(s) |
Efrain Esau de la Rosa Garcia, Jose Alonso Diaz Guillen, Antonio Fernandez Fuentes |
| On-Site Speaker (Planned) |
Efrain Esau de la Rosa Garcia |
| Abstract Scope |
The pyrochlore-type structure (A2B2O7) is significant for applications like solid electrolytes in SOFCs and thermal barrier coatings (TBCs) due to its flexibility in accommodating various cations, which creates vacancies for charge transport and enhances insulating properties by hindering phonon transfer. Despite extensive studies on this structure, the impact of atomic bond electronegativity on its properties remains underexplored. This study examined how the ionic or covalent nature of B4+ bonds affects structural and electrical properties when replacing cations of similar size. Compositions with the general formula Gd2Zr2-xSnxO7 were synthesized via mechanochemical route, thermally treated at 1500°C and 1200°C, and analyzed through impedance spectroscopy, Raman spectroscopy, and XRD. Results showed that Sn4+ with higher electronegativity enhances anionic substructure order, reducing conductivity despite lower Edc, suggesting that cation electronegativity significantly influences pyrochlore order and electrical properties, more so than ionic radius ratios |