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Microstructure, Conductivity, and NO 2 Sensing Characteristics of α‐Al 2 O 3 ‐Doped (8 mol% Sc 2 O 3 )ZrO 2 Composite Solid Electrolyte
Author(s) -
Xiong Weizhen,
Kale Girish M
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.1744-7402.2006.02080.x
Subject(s) - electrolyte , materials science , microstructure , conductivity , analytical chemistry (journal) , composite number , fast ion conductor , ceramic , electrical resistivity and conductivity , solid solution , doping , atmospheric temperature range , electrode , composite material , chemistry , metallurgy , chromatography , thermodynamics , electrical engineering , optoelectronics , engineering , physics
α‐Al 2 O 3 ‐doped (8 mol % Sc 2 O 3 )ZrO 2 composite solid electrolyte has been investigated in the fabrication of solid‐state ceramic gas sensors. The microstructure and electrical conductivity of the composite solid electrolyte have been measured over a range of temperature from 240°C to 596°C. The composite solid electrolyte has been found to exhibit a higher conductivity compared with the commonly used (8 mol% Y 2 O 3 )ZrO 2 at temperatures above ∼448°C. The sensing characteristics for NO 2 detection have been studied in the temperature range of 500–650°C at the low concentration from 10 to 30 ppm and at high concentration from 100 to 500 ppm of NO 2 . The NO 2 sensor was found to respond reproducibly and rapidly to the variations of NO 2 , concentration, indicating that the composite solid electrolyte has promising application as a solid electrolyte for on‐board exhaust gas monitoring.