Details
| Original language | English |
|---|---|
| Pages (from-to) | 46-50 |
| Number of pages | 5 |
| Journal | SOLID STATE IONICS |
| Volume | 211 |
| Early online date | 15 Feb 2012 |
| Publication status | Published - 15 Mar 2012 |
Abstract
For the electrical conductivity of Bi 2Al 4O 9 based dense polycrystalline materials controversial data have been published in the literature. In this work samples with a nominal excess of Bi 2O 3 or SrO of up to 3 wt.% have been investigated in air using impedance spectroscopy. Both the results of this work and the literature data can be consistently interpreted on the basis of a simple model of the microstructure as consisting of Bi 2Al 4O 9 grains and a well conducting grain boundary film (Bi 2O 3 based in the case of a Bi 2O 3 excess) or a poorly conducting grain boundary film (SrO based in the case of a SrO excess), respectively. It turns out that the degree of SrO doping in Bi 2Al 4O 9 is much lower than suggested before. Thus an effect of SrO doping on the electrical conductivity of Bi 2Al 4O 9 can be ruled out.
Keywords
- Electrical conductivity, Polycrystalline bismuth aluminate, SrO doping
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: SOLID STATE IONICS, Vol. 211, 15.03.2012, p. 46-50.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Electrical conductivity of mullite-type Bi 2Al 4O 9 ceramics in air
AU - Ohmann, S.
AU - Fielitz, P.
AU - Dörrer, L.
AU - Borchardt, G.
AU - Gesing, Th M.
AU - Fischer, R. X.
AU - Rüscher, C. H.
AU - Buhl, J. C.
AU - Becker, K. D.
AU - Schneider, H.
N1 - Funding Information: The authors are grateful to the Deutsche Forschungsgemeinschaft (DFG) for financial support of the projects GE 1981/2-1 , FI 442/14-1 , MU 1006/8-1 and FI 881/4-1 as part of the joined project PAK 279. S. Ohmann is indebted to Dr. Michal Schulz for introducing him to impedance spectroscopy and to Dr. O. Schneider for helpful discussions on electrochemical issues. We would like to thank Mr. E. Ebeling for technical assistance.
PY - 2012/3/15
Y1 - 2012/3/15
N2 - For the electrical conductivity of Bi 2Al 4O 9 based dense polycrystalline materials controversial data have been published in the literature. In this work samples with a nominal excess of Bi 2O 3 or SrO of up to 3 wt.% have been investigated in air using impedance spectroscopy. Both the results of this work and the literature data can be consistently interpreted on the basis of a simple model of the microstructure as consisting of Bi 2Al 4O 9 grains and a well conducting grain boundary film (Bi 2O 3 based in the case of a Bi 2O 3 excess) or a poorly conducting grain boundary film (SrO based in the case of a SrO excess), respectively. It turns out that the degree of SrO doping in Bi 2Al 4O 9 is much lower than suggested before. Thus an effect of SrO doping on the electrical conductivity of Bi 2Al 4O 9 can be ruled out.
AB - For the electrical conductivity of Bi 2Al 4O 9 based dense polycrystalline materials controversial data have been published in the literature. In this work samples with a nominal excess of Bi 2O 3 or SrO of up to 3 wt.% have been investigated in air using impedance spectroscopy. Both the results of this work and the literature data can be consistently interpreted on the basis of a simple model of the microstructure as consisting of Bi 2Al 4O 9 grains and a well conducting grain boundary film (Bi 2O 3 based in the case of a Bi 2O 3 excess) or a poorly conducting grain boundary film (SrO based in the case of a SrO excess), respectively. It turns out that the degree of SrO doping in Bi 2Al 4O 9 is much lower than suggested before. Thus an effect of SrO doping on the electrical conductivity of Bi 2Al 4O 9 can be ruled out.
KW - Electrical conductivity
KW - Polycrystalline bismuth aluminate
KW - SrO doping
UR - http://www.scopus.com/inward/record.url?scp=84857793453&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2012.01.030
DO - 10.1016/j.ssi.2012.01.030
M3 - Article
AN - SCOPUS:84857793453
VL - 211
SP - 46
EP - 50
JO - SOLID STATE IONICS
JF - SOLID STATE IONICS
SN - 0167-2738
ER -