Journal
ACTA MATERIALIA
Volume 117, Issue -, Pages 252-261Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.07.024
Keywords
Resistance degradation; Perovskites; Impedance spectroscopy; Conductivity profiles; Combined study of measurement and simulation
Funding
- AFOSR grant [FA9550-14-1-0067, FA9550-14-1-0264]
- National Science Foundation [OCI-0821527]
- National Energy Research Scientific Computing Center - Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
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Resistance degradation in perovslcites is characterized by an increase in current over time with applied electric field. This behavior can be simulated and spatially resolved conductivity profiles can be measured, but some inconsistencies remain. A new approach to address these problems is presented that utilizes time-resolved impedance spectroscopy with an applied DC voltage to provide new insight into the resistance degradation phenomenon. In particular, this method allows the in-situ acquisition of spatio-temporal variations in conductivity. In SrTiO3 a single bulk-dominated maximum of the imaginary part of the modulus M transitions to two maxima during degradation, reflecting the hole conductivity in the anode region and the electron conductivity in the cathode region. To clarify the influence of conductivity profiles on impedance data, the reversed route is presented by using simulated conductivity profiles to calculate impedance data. It will be emphasized that this methodology is not limited to the perovskite system considered here, but can be adapted to any kind of system characterized by a spatially varying conductivity. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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