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Anisotropic Ionic Conductivity Observed in Superplastically Deformed Yttria‐Stabilized Zirconia/Alumina Composite
Author(s) -
Drennan John,
Swain Michael V.,
Badwal Sukhvinder P. S.
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb09728.x
Subject(s) - materials science , superplasticity , anisotropy , composite number , composite material , conductivity , ionic conductivity , yttria stabilized zirconia , perpendicular , grain boundary , pressing , cubic zirconia , microstructure , ceramic , geometry , chemistry , physics , mathematics , electrode , quantum mechanics , electrolyte
Ionic conductivity measurements on a yttria‐stabilized tetragonal zirconia polycry stall alumina composite subjected to superplastic deformation demonstrate anisotropic character. Parallel to the pressing direction, the grain‐boundary resistance to oxygen ion mobility is 25% to 30% higher than that measured perpendicular to the pressing direction. The same directional dependency on the volume conductivity is observed but is less pronounced, showing approximately a 9% difference. Microstructural evidence reveals an agglomeration and elongation of alumina particles perpendicular to the pressing direction, and it is suggested that this phenomenon restricts the passage of ions parallel to the compression direction, giving rise to the anisotropic nature of the conductivity measurements.