Open AccessA GRAIN-BOUNDARY CONDUCTION MODEL FOR STABILIZED-ZIRCONIA
Author(s) -
Guoxin
Publication year - 1998
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.47.1332
Subject(s) - grain boundary , materials science , thermal conduction , yttrium , boundary (topology) , space charge , cubic zirconia , condensed matter physics , space (punctuation) , ceramic , composite material , electron , metallurgy , physics , mathematical analysis , computer science , microstructure , mathematics , quantum mechanics , operating system , oxide
In stabilized-ZrO2 with high-purity, the space-charge contribution plays a dominating role in the grain-boundary resistance. A grain-boundary conduction model is proposed on the basis of this concept, and the effect of the segregations of calcium, yttrium and aluminium on the space-charge conduction is discussed, the segregations are all found to decrease the space-charge conduction, thus increase the grain-boundary resistance. Some formerly-established concepts are evaluated via the model, the limitation of the complex impedance approach based on the Bauerle′s equivalent circuit is pointed out, and the defect of the concept of the resistance per unit interface area of the grain boundaries is also discussed.