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Hydroxyl Defect Effect on Reoxidation of Sc‐Doped ( Ba , Ca )( Ti , Zr ) O 3 Fired in Reducing Atmospheres
Author(s) -
Kao YuJu,
Su CheYi,
Pithan Christian,
Hennings Detlev F.,
Huang ChiYuen,
Waser Rainer
Publication year - 2016
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/jace.14092
Subject(s) - grain boundary , oxygen , conductivity , ionic conductivity , reducing atmosphere , chemistry , dielectric spectroscopy , water vapor , atmosphere (unit) , acceptor , analytical chemistry (journal) , materials science , mineralogy , inorganic chemistry , crystallography , electrolyte , electrochemistry , microstructure , physics , organic chemistry , electrode , chromatography , thermodynamics , condensed matter physics
The behavior of grain and grain‐boundary conductivity of acceptor (Sc)‐doped ( Ba , Ca )( Ti , Zr ) O 3 ceramics sintered in moist reducing atmosphere and subsequently reoxidized in dry and moist atmosphere was investigated by means of impedance spectroscopy ( IS ). In moist firing atmosphere, water vapor was found to react with oxygen vacancies, forming positively charged hydroxyl defects( OH ) 0 ∙ on regular oxygen sites in the crystal lattice. Proton hopping is considered to raise the ionic conductivity significantly. Therefore, hydroxyl defects( OH ) 0 ∙ in turn influence the grain conduction. Hydroxyl defects( OH ) 0 ∙ are also considered to be responsible for alternations of the dielectric maximum at the Curie point.