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Processing and Characterization of Oxygen Sensors Prepared From Freeze‐Dried Calcia‐Stabilized Zirconia Powders
Author(s) -
Zhou Minghua,
Ahmad Aftab
Publication year - 2006
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2006.02075.x
Subject(s) - materials science , microstructure , calcination , cubic zirconia , scanning electron microscope , oxygen sensor , chemical engineering , oxygen , electrolyte , sintering , characterization (materials science) , fast ion conductor , texture (cosmology) , pressing , phase (matter) , metallurgy , composite material , nanotechnology , electrode , ceramic , catalysis , chemistry , organic chemistry , engineering , image (mathematics) , artificial intelligence , computer science , biochemistry
Precursor powders of 15 and 22 mol% calcia‐stabilized zirconia solid electrolytes were synthesized by a freeze‐drying method and calcined at 900°C. Sensor elements were fabricated via uniaxial pressing of the calcined powders and subsequently sintered at 1650°C. X‐ray diffraction and scanning electron microscopy techniques were used to analyze the phase composition and microstructure. The electrical response of the gas sensors to oxygen and the complex impedance in air were investigated at various operating temperatures. The correlation between electrical properties and sensor material chemical compositions as well as microstructure is discussed.