Method for estimating ionicities of oxides using O1s photoelectron spectra

The average valence, ValO, of the oxygen anions in the perovskite oxide BaTiO3, was found using O1s photoelectron spectra to be −1.55. This experimental result is close to the theoretical value for BaTiO3 (−1.63) calculated by Cohen [Nature 358, 136 (1992)] using density functional theory. Using the...

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Bibliographic Details
Published inAIP advances Vol. 5; no. 9; pp. 097210 - 097210-7
Main Authors Wu, L. Q., Li, Y. C., Li, S. Q., Li, Z. Z., Tang, G. D., Qi, W. H., Xue, L. C., Ge, X. S., Ding, L. L.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.09.2015
AIP Publishing LLC
Subjects
ANIONS
BARIUM COMPOUNDS
Barium titanates
CATIONS
DENSITY FUNCTIONAL METHOD
Density functional theory
Dependence
Estimation
Ionization
MATERIALS SCIENCE
OXIDES
OXYGEN
PEROVSKITE
Perovskites
PHOTOELECTRON SPECTROSCOPY
TITANATES
VALENCE
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Summary:The average valence, ValO, of the oxygen anions in the perovskite oxide BaTiO3, was found using O1s photoelectron spectra to be −1.55. This experimental result is close to the theoretical value for BaTiO3 (−1.63) calculated by Cohen [Nature 358, 136 (1992)] using density functional theory. Using the same approach, we obtained values of ValO for several monoxides, and investigated the dependence of ValO and the ionicity on the second ionization energy, V(M2+), of the metal cation. We found that the dependence of the ionicity on V(M2+) in this work is close to that reported by Phillips [Rev. Mod. Phys. 42, 317 (1970)]. We therefore suggest that O1s photoelectron spectrum measurements should be accepted as a general experimental method for estimating the ionicity and average valence of oxygen anions.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4931996