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acceptor-doped SrTiO3; grain boundary; mixed conduction; partial conductivity; impedance spectroscopy; Hebb-Wagner polarization
Abstract:
Hebb-Wagner polarization technique was applied to Fe-doped
SrTiO3 single and bicrystals: as far as a single crystal is
concerned, the polarization is complicated by additional
internal redox reactions, and it has to be appropriately
generalized; as far as a bicrystal is concerned, it was
demonstrated how the electronic and ionic partial
conductivities of a grain boundary can be separated with this
technique. The partial conductivities and the charge carrier
concentrations thus obtained clearly demonstrate that the
electronic and the ionic charge carriers are depleted in the
space charge region, more specifically that the depletion of
the ionic ones is more pronounced, being in agreement with the
double charge of oxygen vacancies. (C) 2002 Elsevier Science
B.V. All rights reserved.
