Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Home
Search
Quick Search
Advanced
Fulltext
Browse
Collections
Persons
My eDoc
Session History
Login
Name:
Password:
Documentation
Help
Support Wiki
Direct access to
document ID:


          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2001     Display Documents



  history
ID: 7419.0, MPI für Festkörperforschung / FKF Publikationen 2001
The effect of the oxygen exchange at electrodes on the high-voltage electrocoloration of Fe-doped SrTiO3 single crystals: A combined SIMS and microelectrode impedance study
Authors:Rodewald, S.; Sakai, N.; Yamaji, K.; Yokokawa, H.; Fleig, J.; Maier, J.
Language:English
Date of Publication (YYYY-MM-DD):2001
Title of Journal:Journal of Electroceramics
Volume:7
Issue / Number:2
Start Page:95
End Page:105
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The effect of the electrode material on the high voltage
stoichiometry-polarization ("electrocoloration") of Fe-doped
SrTiO3 single crystals has been studied. For different
electrode materials (150-nm Ag/15-nm Cr and 150-nm Au/15-nm Cr)
secondary ion mass spectrometry (SIMS) was used to measure the
depth profile of the O-18-isotope after high-field stress. The
results were compared with spatially resolved impedance
measurements on electrocolored Fe-doped SrTiO3 single crystals.
For Au/Cr as well as Ag/Cr electrodes a large dc voltage leads
to moving color fronts which are usually correlated with a
pronounced stoichiometry polarization of the samples due to
electrodes blocking the ionic current. However, the local
impedance measurements demonstrate that the conductivity
profiles near the cathode depend on the electrode material.
This finding is in accordance with the SIMS measurements which
indicate that the Ag/Cr-electrodes are, in contrast to Au/Cr-
electrodes not completely inactive for the oxygen incorporation
into the Fe-doped SrTiO3. The results are discussed in terms of
defect chemical models.
Free Keywords:strontium titanate; electrocoloration; impedance spectroscopy;
SIMS; oxygen exchange
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany
Identifiers:ISI:000173565000004
ISSN:1385-3449
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.