Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10624249 | Ceramics International | 2016 | 23 Pages |
Abstract
Crystallographic features, physical properties and ionic release from yttria stabilized zirconia (YSZ) in suspension were studied by means of XRD, TEM, light-scattering particle size, BET, ICP and zeta potential analysis. It was found that Zr, Y, Na, and to a lesser extent Ca, Hf and Pd leach from 8Â mol% YSZ powder. The impurities present increase the zeta potential of suspensions made from as-received YSZ. A trace amount of tetragonal phase observed in 8Â mol% YSZ persists following washing and calcination-milling. Dislocations and crystallographic defects together with fractured crystals which form during milling of the calcined powder should lead to the formation of more broken bonds; as a result the surface of the particles can support higher surface charge density. Washing and calcination-milling lead to a shift of the isoelectric point of 8Â mol% YSZ from pH 8.4 to pH 6.3 and 6.8, respectively. Due to higher chemical stability and previously shown positive impacts on microstructure and performance of fuel cells, use of calcined YSZ can be more advantageous than as received powder.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Amir Reza Hanifi, Beniamin Zahiri, David Mitlin, Adrien L. Vincent, Thomas H. Etsell, Partha Sarkar,