Concentration-dependent ionic conductivity and thermal stability of magnetron-sputtered nanocrystalline scandia-stabilized zirconia
2010 (English)In: SOLID STATE IONICS, ISSN 0167-2738, Vol. 181, no 23-24, 1140-1145 p.Article in journal (Refereed) Published
Nanocrystalline (nc) scandia-stabilized zirconia (SSZ) electrolytes with scandia contents of 5.9 to 15.9 mol% ere synthesized by reactive magnetron sputtering. For scandia content andgt;= 9.1 mol%, the as-deposited films were pure cubic phase with andlt; 111 andgt; texture, while traces of tetragonal phase was found for lower Sc content. Single-line profile analysis of the 111 X-ray diffraction peak yielded an out-of-plane grain size of similar to 10 nm and a microstrain of 2.0-2.2%, regardless of scandia content, for films deposited at 400 degrees C and a bias of -70 V. Films deposited at higher bias voltages showed a reduced grain size, yielding a grain size of similar to 6 nm and a microstrain of similar to 2.5% at -200 V and -250 V with additional incorporation of argon. Temperature-dependent impedance spectroscopy of the SSZ films showed that the in-plane ionic conductivity had a maximum close to 10.7 mol% and decreased almost an order of magnitude as the scandia - content was increased to 15.9 mol%. The activation energy for oxygen ion migration was determined to be between 130-1.43 eV. In addition, no dependence on grain size was observed. The above observations suggest a bulk mechanism for ionic conduction.
Place, publisher, year, edition, pages
Elsevier Science B.V., Amsterdam. , 2010. Vol. 181, no 23-24, 1140-1145 p.
SSZ, Physical vapor deposition, X-ray diffraction, Impedance spectroscopy
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-59487DOI: 10.1016/j.ssi.2010.06.010ISI: 000281487500011OAI: oai:DiVA.org:liu-59487DiVA: diva2:352094
M Sillassen, Per Eklund, N Pryds, N Bonanos and J Bottiger, Concentration-dependent ionic conductivity and thermal stability of magnetron-sputtered nanocrystalline scandia-stabilized zirconia, 2010, SOLID STATE IONICS, (181), 23-24, 1140-1145.
Copyright: Elsevier Science B.V., Amsterdam.