Oxidation states of titanium in bulk barium titanates and in (100) fiber-textured (Bacursive chiSr1-cursive chi)Ti1+yO3+z thin films

S. Stemmer, T. Höche, R. Keding, C. Rüssel, R. Schneider, N. D. Browning, S. K. Streiffer, H. J. Kleebe

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Abstract

Chemical shifts of titanium L edges and oxygen K edges in electron energy-loss spectroscopy in transmission electron microscopy were used to detect valence state reduction of Ti in bulk barium titanates, used as reference materials, and in (Bacursive chiSr1-cursive chi)Ti1+yO3+z (BST) thin films grown with excess Ti. A hollandite-type Ba titanate, containing Ti with an average valence state of approximately 3.7 in octahedral coordination, showed large chemical shifts relative to rutile TiO2 and BaTiO3, containing only Ti4+. In BST, chemical shifts relative to BaTiO3 were measured from grain interiors of columnar films with different amounts of excess Ti. We found that shifts, corresponding to an average valence state of Ti smaller than nominal 4+, increase with increasing amounts of excess Ti in the films. The results show that at least some amount of excess Ti is accommodated in these films by a defect mechanism that requires a reduction of the average valence state of Ti.

Original languageEnglish
Pages (from-to)3149-3151
Number of pages3
JournalApplied Physics Letters
Volume79
Issue number19
DOIs
StatePublished - Nov 5 2001
Externally publishedYes

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