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Electrical Characterization of Sr 0.97 Ti 1− x Fe x O 3−δ by Complex Impedance Spectroscopy: I, Materials with Low Iron Contents
Author(s) -
Jurado Jose R.,
Colomer Marie T.,
Frade Jorge R.
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01622.x
Subject(s) - grain boundary , sintering , conductivity , materials science , dielectric spectroscopy , analytical chemistry (journal) , electrical resistivity and conductivity , mineralogy , spectroscopy , relaxation (psychology) , grain boundary diffusion coefficient , activation energy , condensed matter physics , metallurgy , microstructure , chemistry , electrical engineering , physics , psychology , social psychology , electrode , chromatography , electrochemistry , engineering , quantum mechanics
Impedance spectroscopy has been used to characterize Sr 0.97 Ti 1− x Fe x O 3−δ materials. This technique was suitable to evaluate the grain and grain‐boundary conductivities of samples with ≤5% iron. The role of grain boundaries was changed by sintering in different conditions, and this was interpreted by accounting for microstructural differences. The corresponding relaxation times were also used to confirm the interpretation of complex impedance spectra. The values of grain‐boundary conductivity and the corresponding values of activation energy obtained by this method were relatively close to predictions obtained on assuming a p → n inversion at the grain‐boundary core, as proposed by Waser and coauthors.1–3 The temperature dependence of relaxation times confirmed this finding.