Volume 134, 2007

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

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 θ = 2.3, 5.4 and 7.8° were examined. The area specific capacitances obtained for the 5.4 and 7.8° boundaries are consistent with values predicted from a one-dimensional double-Schottky-barrier model. For the 2.3° 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.

Article information

Article type
Paper
Submitted
27 Feb 2006
Accepted
05 May 2006
First published
21 Jul 2006

Faraday Discuss., 2007,134, 235-245

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

R. A. De Souza and J. Maier, Faraday Discuss., 2007, 134, 235 DOI: 10.1039/B602914K

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