You are here
VIBRATIONAL AND MECHANICAL PROPERTIES OF 10 MOL % SC2O3-1 MOL % CEO2- ZRO2 ELECTROLYTE CERAMICS FOR SOLID OXIDE FUEL CELLS
| Title: | VIBRATIONAL AND MECHANICAL PROPERTIES OF 10 MOL % SC2O3-1 MOL % CEO2- ZRO2 ELECTROLYTE CERAMICS FOR SOLID OXIDE FUEL CELLS. |
 54 views 27 downloads |
|---|---|---|
| Name(s): |
Lukich, Svetlana, Author Orlovskaya, Nina, Committee Chair University of Central Florida, Degree Grantor |
|
| Type of Resource: | text | |
| Date Issued: | 2009 | |
| Publisher: | University of Central Florida | |
| Language(s): | English | |
| Abstract/Description: | Solid Oxide Fuel Cells (SOFCs) are emerging as a potential breakthrough energy conversion technology for clean and efficient production of electricity and heat from hydrogen and hydro-carbon fuels. Sc0.1Ce0.01ZrO2 electrolytes for Solid Oxide Fuel Cells are very promising materials because their high ionic conductivity in the intermediate temperature range 700oC-800oC. The vibration response of cubic and rhombohedral (β) 10 mol%Sc2O3 - 1 mol%CeO2 - ZrO2 (Sc0.1Ce0.01ZrO2 ) both at room and high-temperatures is reported. The in-situ heating experiments and ex-situ indentation experiments were performed to characterize the vibrational behavior of these important materials. A temperature and stress-assisted phase transition from cubic to rhombohedral phase was detected during in-situ Raman spectroscopy experiments. While heating and indentation experiments performed separately did not cause the transition of the cubic phase into the rhombohedral structure under the performed experimental conditions and only broadened or strained peaks of the cubic phase could be detected, the heating of the indented (strained) surface leaded to the formation of the rhombohedral Sc0.1Ce0.01ZrO2. Both temperature range and strained zone were estimated by in situ heating and 2D mapping, where a formation of rhombohedral or retention of cubic phase has been promoted. The mechanical properties, such as Young's modulus, Vickers hardness, indentation fracture resistance, room and high temperature four point bending strength and SEVNB fracture toughness along with the stress – strain deformation behavior in compression, of 10 mol% Sc2O3 – 1 mol % CeO2 - ZrO2 (ScCeZrO2) ceramics have been studied. The chosen composition of the ScCeZrO2 has very high ionic conductivity and, therefore, is very promising oxygen ion conducting electrolyte for the intermediate temperature Solid Oxide Fuel Cells. Therefore, its mechanical behavior is of importance and is presented in this study. | |
| Identifier: | CFE0002914 (IID), ucf:52845 (fedora) | |
| Note(s): |
2009-12-01 M.S.M.S.E. Engineering and Computer Science, Department of Mechanical Materials and Aerospace Engineering Masters This record was generated from author submitted information. |
|
| Subject(s): |
micro-Raman spectroscopy cubic phase rhombohedral phase zirconia Vickers indentation Young's modulus strength fracture toughness stress' strain deformation behavior and compression |
|
| Persistent Link to This Record: | http://purl.flvc.org/ucf/fd/CFE0002914 | |
| Restrictions on Access: | public | |
| Host Institution: | UCF |
