Details
| Original language | English |
|---|---|
| Pages (from-to) | 159-164 |
| Number of pages | 6 |
| Journal | SOLID STATE IONICS |
| Volume | 131 |
| Issue number | 1 |
| Publication status | Published - 1 Jun 2000 |
| Event | The 1998 International Workshop on Interfacially Controlled Functional Materials: Electrical and Chemical Properties - Schloss Ringberg, Ger Duration: 8 Mar 1998 → 13 Mar 1998 |
Abstract
Ionic conductivity data on nanocrystalline CaF2 is evaluated. The d.c. conductivity is distinctly than larger in coarse-grained materials. The impedance plot exhibits two regimes: a high- and a low-frequency semicircle, the diameters of which increase with increasing grain size. The high-frequency semicircle reflects both bulk transport plus transport along the boundaries while the low-frequency semicircle describes the blocking effect of the grain boundaries. Absolute values and activation energy of the conductivity suggest dominating transport along space charge layers. The increase of the low frequency semicircle is due to increased current constriction because of the appearance of large pores.
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. 131, No. 1, 01.06.2000, p. 159-164.
Research output: Contribution to journal › Conference article › Research › peer review
}
TY - JOUR
T1 - Local and overall ionic conductivity in nanocrystalline CaF2
AU - Puin, W.
AU - Rodewald, S.
AU - Ramlau, R.
AU - Heitjans, P.
AU - Maier, J.
N1 - Funding Information: The authors thank the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie for financial support.
PY - 2000/6/1
Y1 - 2000/6/1
N2 - Ionic conductivity data on nanocrystalline CaF2 is evaluated. The d.c. conductivity is distinctly than larger in coarse-grained materials. The impedance plot exhibits two regimes: a high- and a low-frequency semicircle, the diameters of which increase with increasing grain size. The high-frequency semicircle reflects both bulk transport plus transport along the boundaries while the low-frequency semicircle describes the blocking effect of the grain boundaries. Absolute values and activation energy of the conductivity suggest dominating transport along space charge layers. The increase of the low frequency semicircle is due to increased current constriction because of the appearance of large pores.
AB - Ionic conductivity data on nanocrystalline CaF2 is evaluated. The d.c. conductivity is distinctly than larger in coarse-grained materials. The impedance plot exhibits two regimes: a high- and a low-frequency semicircle, the diameters of which increase with increasing grain size. The high-frequency semicircle reflects both bulk transport plus transport along the boundaries while the low-frequency semicircle describes the blocking effect of the grain boundaries. Absolute values and activation energy of the conductivity suggest dominating transport along space charge layers. The increase of the low frequency semicircle is due to increased current constriction because of the appearance of large pores.
UR - http://www.scopus.com/inward/record.url?scp=0033702268&partnerID=8YFLogxK
U2 - 10.1016/S0167-2738(00)00630-5
DO - 10.1016/S0167-2738(00)00630-5
M3 - Conference article
AN - SCOPUS:0033702268
VL - 131
SP - 159
EP - 164
JO - SOLID STATE IONICS
JF - SOLID STATE IONICS
SN - 0167-2738
IS - 1
T2 - The 1998 International Workshop on Interfacially Controlled Functional Materials: Electrical and Chemical Properties
Y2 - 8 March 1998 through 13 March 1998
ER -