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Space Charge‐Mediated Ionic Transport in Yttria‐Stabilized Zirconia–Alumina Composite Membranes
Author(s) -
Kumar Binod,
Thokchom Joykumar S.
Publication year - 2008
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.1551-2916.2008.02257.x
Subject(s) - yttria stabilized zirconia , materials science , ionic conductivity , membrane , scanning electron microscope , cubic zirconia , composite number , sintering , microstructure , ionic bonding , conductivity , chemical engineering , composite material , ceramic , chemistry , ion , electrolyte , organic chemistry , biochemistry , electrode , engineering
This paper reports ionic conductivity of yttria‐stabilized zirconia (YSZ)–Al 2 O 3 composite membranes. The tape cast specimens were subjected to binder burnout (500°C) and sintering (1550°C) processes to obtain 200–300 μm thick membranes. The ionic conductivity and microstructure of the membranes were characterized and are discussed in this paper. The ionic conductivity of the composite specimens was enhanced and was correlated with the number of charge carrier and their mobility. The solubility of Al 2 O 3 in YSZ was minimal and nanosize Al 2 O 3 of the batch sintered into microsize and existed as a distinct phase. The scanning electron microscopy micrographs revealed that YSZ and Al 2 O 3 grains were strained.