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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 646 pages |
| ISBN: | 978-0-9879917-6-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
A.C. Impedance Study On The Aging Behavior Of 8.5YSZ And 6.5MSZ At 1100℃
Huiyu Lee1; Xingmin Guo1; Shan Ke2;1UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING, Beijing, China; 2SCHOOL OF METALLURGICAL AND ECOLOGICAL ENGINEERING, , China;
Type of Paper: Regular
Id Paper: 343
Topic: 9
Abstract:
Electrical conductivity measurements were carried out by A.C. Impedance spectroscopy respectively on 8.5 mol% yttira-stabilised zirconia(8.5YSZ) and 6.5 mol% magnesia-stabilized zirconia (6.5MSZ) within 216h annealing duration at 1100℃ in dry air. Electrical conductivities exhibited dramatic degradation with the time. Total conductivities of 8.5YSZ decreased by 44.7% while 7.5MSZ decreased by 68.3%. Grain resistance and grain boundary resistance were investigated by A.C. Impedance spectroscopy. Both grain resistance and grain boundary resistance showed significant magnification, however grain boundary resistance increased faster than grain. XRD performed for possible change in microstructure demonstrated no phase transition and precipitation of impurity. The aging effect of partial stabilised zirconia can be attributed to the transformation of defect associates of dipoles into tripoles during annealing process. The faster increased resistance of grain boundary was interpreted by the different distribution of and in grain and grain boundary.