Effect of non-stoichiometry on the protonic and oxygen-ionic conductivity of Sr2(ScNb)O6: a complex perovskite
作者： AS Nowick , KC Liang , None
DOI: 10.1016/S0167-2738(99)00326-4
关键词: Ionic conductivity 、 Stoichiometry 、 Conductivity 、 Ionic bonding 、 Perovskite (structure) 、 Ion 、 Inorganic chemistry 、 Physical chemistry 、 Activation energy 、 Hydrogen 、 Chemistry
摘要: Abstract The compound Sr 2 (Sc 1+ x Nb 1− )O 6− has the ABO 3 perovskite structure. It becomes non-stoichiometric by changing ratio of Sc 3+ to 5+ ions, i.e. varying . For >0, this is an oxygen ionic conductor, but it excellent protonic with activation energy 0.63 eV, after pretreatment in water vapor. conductivity shown vary proportionately , characteristic Stage II (unassociated) behavior. In case samples ≤0, does not take up hydrogen, and, fact, remains conductor even though oxygen-vacancy concentration suppressed negative There no evidence for conduction electronic defects or A- B-site vacancies.
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