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Electron spin resonance investigation of oxygen-vacancy-related defects in BaTiO3 thin films

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8 Author(s)
Laguta, V.V. ; Institute for Problems of Material Science, NASc of Ukraine, 3 Krjijanovskogo Strasse, 03680 Kiev, Ukraine ; Slipenyuk, A.M. ; Bykov, I.P. ; Glinchuk, M.D.
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The Ti3+ center, based on a regular Ti site perturbed by an oxygen vacancy (VO), is identified by electron spin resonance (ESR) in textured BaTiO3 films. The center shows tetragonal symmetry along cubic <100> axes with g-factors: g||=1.997, g=1.904. The spectrum of this defect disappeared after the film annealing at 700 °C in an O2 atmosphere. We describe the observed spectrum as Ti3+VO couple defects or F+ center, which have never been observed in bulk BaTiO3. ESR is thus a unique tool to identify oxygen-vacancy-related defects, which have a large effect on the performance of ferroelectric films.

Published in:

Applied Physics Letters  (Volume:87 ,  Issue: 2 )

Date of Publication:

Jul 2005

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