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Electrical resistance of low-angle tilt grain boundaries in acceptor-doped SrTiO3 as a function of misorientation angle

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6 Author(s)
De Souza, Roger A. ; Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany ; Fleig, J. ; Maier, Joachim ; Zhang, Zaoli
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The transport of charge across symmetrical low-angle [001] tilt grain boundaries in Fe-doped SrTiO3 was examined. Grain boundary resistances were obtained from impedance spectroscopy measurements on bicrystals with misorientation angles θ=2.3°, 5.4°, and 7.8° as a function of temperature and oxygen partial pressure. By comparing these data with values predicted from a double Schottky-barrier model, we show that the resistance of a low-angle tilt grain boundary in acceptor-doped SrTiO3 is correlated with its dislocation content, but in a nontrivial manner.

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Journal of Applied Physics  (Volume:97 ,  Issue: 5 )