Details
| Original language | English |
|---|---|
| Title of host publication | Advances in Solid Oxide Fuel Cells IX - A Collection of Papers Presented at the 37th International Conference on Advanced Ceramics and Composites, ICACC 2013 |
| Pages | 103-114 |
| Number of pages | 12 |
| Edition | 4 |
| Publication status | Published - 21 Oct 2013 |
| Event | Advances in Solid Oxide Fuel Cells IX - 37th International Conference on Advanced Ceramics and Composites, ICACC 2013 - Daytona Beach, FL, United States Duration: 27 Jan 2013 → 1 Feb 2013 |
Publication series
| Name | Ceramic Engineering and Science Proceedings |
|---|---|
| Number | 4 |
| Volume | 34 |
| ISSN (Print) | 0196-6219 |
Abstract
Mullite, Al4.8Si1.2O9.6, and mullite type componds Bi2M4O9 with M = Fe, Al were investigated by impedance spectroscopy between 1 Hz and 1 MHz and temperatures between 200°C and 800°C. The data reveal universal dielectric response (UDR) type behaviour which could be separated as σ(ν) = σ0 + Aνs and ε(ν) = εst + Aνs-1tan(sπ/2)/ε0, however, with the s parameter dependent on temperature and frequency. Specific σ0 values of the crystal plates could be extracted which are about 10-8 S/cm for mullite, 10-7 S/cm for Bi2Al4O 9 and 10-6 S/cm for Bi2Fe4O 9 taken at 500°C. The main peak in the Modulus representation M″ is given by 2πνc = σ0/ε stε0 identifying the net rate of thermally activated excitations 2πνc = 2πν0exp(-Ea/kT) of relevant charge carriers. Ea of about 1.3 eV and 1 eV are obtained for Bi2M4O9 and mullite, respectively. With increasing temperature effects related to ion blocking at electrodes are observed towards lower frequencies. It is discussed that for mullite σ0 is related to impurity charge carriers (Na+, H+, etc.) whereas for Bi2Al4O9 and Bi2Fe4O9 "intrinsic" diffusion of Al, Fe via Frenkel type defects may not be ruled out.
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
Advances in Solid Oxide Fuel Cells IX - A Collection of Papers Presented at the 37th International Conference on Advanced Ceramics and Composites, ICACC 2013. 4. ed. 2013. p. 103-114 (Ceramic Engineering and Science Proceedings; Vol. 34, No. 4).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Ionic conductivity in mullite and mullite type compounds
AU - Rüscher, C. H.
AU - Kiesel, F.
PY - 2013/10/21
Y1 - 2013/10/21
N2 - Mullite, Al4.8Si1.2O9.6, and mullite type componds Bi2M4O9 with M = Fe, Al were investigated by impedance spectroscopy between 1 Hz and 1 MHz and temperatures between 200°C and 800°C. The data reveal universal dielectric response (UDR) type behaviour which could be separated as σ(ν) = σ0 + Aνs and ε(ν) = εst + Aνs-1tan(sπ/2)/ε0, however, with the s parameter dependent on temperature and frequency. Specific σ0 values of the crystal plates could be extracted which are about 10-8 S/cm for mullite, 10-7 S/cm for Bi2Al4O 9 and 10-6 S/cm for Bi2Fe4O 9 taken at 500°C. The main peak in the Modulus representation M″ is given by 2πνc = σ0/ε stε0 identifying the net rate of thermally activated excitations 2πνc = 2πν0exp(-Ea/kT) of relevant charge carriers. Ea of about 1.3 eV and 1 eV are obtained for Bi2M4O9 and mullite, respectively. With increasing temperature effects related to ion blocking at electrodes are observed towards lower frequencies. It is discussed that for mullite σ0 is related to impurity charge carriers (Na+, H+, etc.) whereas for Bi2Al4O9 and Bi2Fe4O9 "intrinsic" diffusion of Al, Fe via Frenkel type defects may not be ruled out.
AB - Mullite, Al4.8Si1.2O9.6, and mullite type componds Bi2M4O9 with M = Fe, Al were investigated by impedance spectroscopy between 1 Hz and 1 MHz and temperatures between 200°C and 800°C. The data reveal universal dielectric response (UDR) type behaviour which could be separated as σ(ν) = σ0 + Aνs and ε(ν) = εst + Aνs-1tan(sπ/2)/ε0, however, with the s parameter dependent on temperature and frequency. Specific σ0 values of the crystal plates could be extracted which are about 10-8 S/cm for mullite, 10-7 S/cm for Bi2Al4O 9 and 10-6 S/cm for Bi2Fe4O 9 taken at 500°C. The main peak in the Modulus representation M″ is given by 2πνc = σ0/ε stε0 identifying the net rate of thermally activated excitations 2πνc = 2πν0exp(-Ea/kT) of relevant charge carriers. Ea of about 1.3 eV and 1 eV are obtained for Bi2M4O9 and mullite, respectively. With increasing temperature effects related to ion blocking at electrodes are observed towards lower frequencies. It is discussed that for mullite σ0 is related to impurity charge carriers (Na+, H+, etc.) whereas for Bi2Al4O9 and Bi2Fe4O9 "intrinsic" diffusion of Al, Fe via Frenkel type defects may not be ruled out.
UR - http://www.scopus.com/inward/record.url?scp=84891899941&partnerID=8YFLogxK
U2 - 10.1002/9781118807750.ch10
DO - 10.1002/9781118807750.ch10
M3 - Conference contribution
AN - SCOPUS:84891899941
SN - 9781118807644
T3 - Ceramic Engineering and Science Proceedings
SP - 103
EP - 114
BT - Advances in Solid Oxide Fuel Cells IX - A Collection of Papers Presented at the 37th International Conference on Advanced Ceramics and Composites, ICACC 2013
T2 - Advances in Solid Oxide Fuel Cells IX - 37th International Conference on Advanced Ceramics and Composites, ICACC 2013
Y2 - 27 January 2013 through 1 February 2013
ER -