Capacitance of single crystal and low-angle tilt bicrystals of Fe-doped SrTiO3

De Souza, R. A.; Maier, J.

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Capacitance of single crystal and low-angle tilt bicrystals of Fe-doped SrTiO₃

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De Souza, R. A.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Maier, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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De Souza, R. A., & Maier, J. (2007). Capacitance of single crystal and low-angle tilt bicrystals of Fe-doped SrTiO₃. Faraday Discussions, 134, 235-245.

Cite as: https://hdl.handle.net/21.11116/0000-000F-01A5-5

Abstract

We used a. c. impedance spectroscopy to study the capacitance of single crystal and bicrystal Fe-doped SrTiO3. Measurements performed on a single crystal sample indicate unequivocally that the bulk dielectric permittivity is dependent on defect concentration. Three symmetrical [001] tilt bicrystals with misorientation angles theta = 2.3, 5.4 and 7.81 were examined. The area specific capacitances obtained for the 5.4 and 7.81 boundaries are consistent with values predicted from a one-dimensional double-Schottky-barrier model. For the 2.31 boundary, more complex behaviour was observed. This is attributed to the electrical non-uniformity of the interface becoming significant at large dislocation separation. The effects of a d.c. bias on the impedance of the bicrystals was also investigated.