Details
| Original language | English |
|---|---|
| Pages (from-to) | 885-888 |
| Number of pages | 4 |
| Journal | Nanostructured Materials |
| Volume | 6 |
| Issue number | 5-8 |
| Publication status | Published - 1995 |
Abstract
The frequency dependent (ac) conductivity of nanocrystalline CaF2 (n-CaF2) was measured by impedance spectroscopy between 5Hz and 13MHz and at temperatures from 390K to 500K. The real part of the conductivity at low frequencies is by more than four orders of magnitude greater than the do value of single crystalline CaF2 (s-CaF2). Moreover the activation energy is less than one third of that of the intrinsic conductivity in s-CaF2. This indicates an increased mobility of the F--ions in the interfacial regions. Complex impedance spectra before and after an annealing process are interpreted in terms of the ion dynamics in the grains and the interfaces similar to recent work on polycrystalline materials.
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Nanostructured Materials, Vol. 6, No. 5-8, 1995, p. 885-888.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Frequency dependent ionic conductivity in nanocrystalline CaF2 studied by impedance spectroscopy
AU - Puin, W.
AU - Heitjans, P.
N1 - Funding Information: We thank H. Gleiter and W. Dickenscheid for support and hospitality des Saarlandes and M.D. Ingram, J. Maier and A. Schirmer for helpful work was supported by DFG and BMFT.
PY - 1995
Y1 - 1995
N2 - The frequency dependent (ac) conductivity of nanocrystalline CaF2 (n-CaF2) was measured by impedance spectroscopy between 5Hz and 13MHz and at temperatures from 390K to 500K. The real part of the conductivity at low frequencies is by more than four orders of magnitude greater than the do value of single crystalline CaF2 (s-CaF2). Moreover the activation energy is less than one third of that of the intrinsic conductivity in s-CaF2. This indicates an increased mobility of the F--ions in the interfacial regions. Complex impedance spectra before and after an annealing process are interpreted in terms of the ion dynamics in the grains and the interfaces similar to recent work on polycrystalline materials.
AB - The frequency dependent (ac) conductivity of nanocrystalline CaF2 (n-CaF2) was measured by impedance spectroscopy between 5Hz and 13MHz and at temperatures from 390K to 500K. The real part of the conductivity at low frequencies is by more than four orders of magnitude greater than the do value of single crystalline CaF2 (s-CaF2). Moreover the activation energy is less than one third of that of the intrinsic conductivity in s-CaF2. This indicates an increased mobility of the F--ions in the interfacial regions. Complex impedance spectra before and after an annealing process are interpreted in terms of the ion dynamics in the grains and the interfaces similar to recent work on polycrystalline materials.
UR - http://www.scopus.com/inward/record.url?scp=0029235227&partnerID=8YFLogxK
U2 - 10.1016/0965-9773(95)00201-4
DO - 10.1016/0965-9773(95)00201-4
M3 - Article
AN - SCOPUS:0029235227
VL - 6
SP - 885
EP - 888
JO - Nanostructured Materials
JF - Nanostructured Materials
SN - 0965-9773
IS - 5-8
ER -