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Defect Chemistry of (La,Sr)MnO3
Author(s) -
Nowotny Janusz,
Rekas Mieczyslaw
Publication year - 1998
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.1151-2916.1998.tb02297.x
Subject(s) - strontium , oxygen , cluster (spacecraft) , materials science , conductivity , electrical resistivity and conductivity , mineralogy , chemistry , physics , computer science , organic chemistry , quantum mechanics , programming language
Defect‐disorder models are derived for undoped and strontium‐doped LaMnO 3 . A random‐defect model and a cluster‐defect model are both considered within the regimes that correspond to oxygen deficit and oxygen excess. The models are constructed based on the experimental nonstoichiometry data that was reported by previous researchers. According to both models, the addition of strontium leads to an increase of the concentration of electron holes and oxygen nonstoichiometry. The defect clusters that are predicted by the cluster model have a marked concentration only at very low oxygen partial pressures. Both models are verified against the electrical‐conductivity data. A good agreement between the random‐defect model and the experimental data is shown.