Muhammad, Qaisar Khushi ; Valderrama, Marcela ; Yue, Mengkun ; Opitz, Alexander Karl ; Taibl, Stefanie ; Siebenhofer, Matthäus ; Bruder, Enrico ; Fleig, Jürgen ; Fang, Xufei ; Frömling, Till (2023)
Dislocation-tuned electrical conductivity in solid electrolytes (9YSZ): a micro-mechanical approach.
In: Journal of the American Ceramic Society, 106 (11)
doi: 10.1111/jace.19291
Article, Bibliographie
This is the latest version of this item.
Abstract
Tailoring the electrical conductivity of functional ceramics by introducing dislocations is a comparatively recent research focus, and its merits were demonstrated through mechanical means. Especially bulk deformation at high temperatures is suggested to be a promising method to introduce a high dislocation density. So far, however, controlling dislocation generation and their annihilation remains difficult. Although deforming ceramics generate dislocations on multiple length scales, dislocation annihilation at the same time appears to be the bottleneck to use the full potential of dislocationstailoring the electrical conductivity. Here, we demonstrate the control over these aspects using a micromechanical approach on yttria-stabilized zirconia-YSZ. Targeted indentation well below the dislocation annihilation temperature resulted in extremely dense dislocation networks, visualized by chemical etching and electron channeling contrast imaging. Microcontact-impedance measurements helped evaluate the electrical response of operating individual slip systems. A significant conductivity enhancement is revealed in dislocationrich regions compared to pristine ones in fully stabilized YSZ. This enhancement is mainly attributed to oxygen ionic conductivity. Thus, the possibility of increasing the conductivity is illustrated and provides a prospect to transfer the merits of dislocation-tuned electrical conductivity to solid oxygen electrolytes.
| Item Type: | Article |
|---|---|
| Erschienen: | 2023 |
| Creators: | Muhammad, Qaisar Khushi ; Valderrama, Marcela ; Yue, Mengkun ; Opitz, Alexander Karl ; Taibl, Stefanie ; Siebenhofer, Matthäus ; Bruder, Enrico ; Fleig, Jürgen ; Fang, Xufei ; Frömling, Till |
| Type of entry: | Bibliographie |
| Title: | Dislocation-tuned electrical conductivity in solid electrolytes (9YSZ): a micro-mechanical approach |
| Language: | English |
| Date: | 6 September 2023 |
| Place of Publication: | Oxford |
| Publisher: | Wiley-Blackwell |
| Journal or Publication Title: | Journal of the American Ceramic Society |
| Volume of the journal: | 106 |
| Issue Number: | 11 |
| DOI: | 10.1111/jace.19291 |
| Corresponding Links: | |
| Abstract: | Tailoring the electrical conductivity of functional ceramics by introducing dislocations is a comparatively recent research focus, and its merits were demonstrated through mechanical means. Especially bulk deformation at high temperatures is suggested to be a promising method to introduce a high dislocation density. So far, however, controlling dislocation generation and their annihilation remains difficult. Although deforming ceramics generate dislocations on multiple length scales, dislocation annihilation at the same time appears to be the bottleneck to use the full potential of dislocationstailoring the electrical conductivity. Here, we demonstrate the control over these aspects using a micromechanical approach on yttria-stabilized zirconia-YSZ. Targeted indentation well below the dislocation annihilation temperature resulted in extremely dense dislocation networks, visualized by chemical etching and electron channeling contrast imaging. Microcontact-impedance measurements helped evaluate the electrical response of operating individual slip systems. A significant conductivity enhancement is revealed in dislocationrich regions compared to pristine ones in fully stabilized YSZ. This enhancement is mainly attributed to oxygen ionic conductivity. Thus, the possibility of increasing the conductivity is illustrated and provides a prospect to transfer the merits of dislocation-tuned electrical conductivity to solid oxygen electrolytes. |
| Uncontrolled Keywords: | dislocations, mechanical deformation, nanoindentation, oxygen–ionic conductivity, SOEC, SOFC, solid electrolytes, yttria-stabilized zirconia |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy |
| Date Deposited: | 07 Sep 2023 05:21 |
| Last Modified: | 19 Jul 2024 10:43 |
| PPN: | 511338732 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
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Dislocation‐tuned electrical conductivity in solid electrolytes (9YSZ): A micro‐mechanical approach. (deposited 07 Nov 2023 12:41)
- Dislocation-tuned electrical conductivity in solid electrolytes (9YSZ): a micro-mechanical approach. (deposited 07 Sep 2023 05:21) [Currently Displayed]
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