Details
| Original language | English |
|---|---|
| Pages (from-to) | 11251-11262 |
| Number of pages | 12 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 12 |
| Issue number | 37 |
| Publication status | Published - 2010 |
Abstract
The mechanosynthesis of highly pure nanocrystalline BaLiF3 is reported. The product with mean crystallite diameter of about 30 nm was prepared by joint high-energy ball-milling of the two binary fluorides LiF and BaF2 at ambient temperature. Compared to coarse-grained BaLiF3 with µm-sized crystallites, which is available via conventional solid-state synthesis at much higher temperatures, the mechanosynthesized product exhibits a drastic increase of ionic conductivity by several orders of magnitude. This is presumably due to structural disorder introduced during milling and to the presence of a large volume fraction of interfacial regions in the nanocrystalline form of BaLiF3 providing fast diffusion pathways for the charge carriers. Starting from mechanosynthesized nanocrystalline BaLiF3 it is possible to tune the transport parameters in a well defined way by subsequent annealing. Changes of the electrical response of mechanosynthesized BaLiF3 during annealing are studied in situ by impedance spectroscopy. The results are compared with those of a structurally well-ordered single crystal which clearly shows extrinsic and intrinsic regions of ionic conduction.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Physical Chemistry Chemical Physics, Vol. 12, No. 37, 2010, p. 11251-11262.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Mechanosynthesized nanocrystalline BaLiF3
T2 - The impact of grain boundaries and structural disorder on ionic transport
AU - Düvel, Andre
AU - Wilkening, Martin
AU - Uecker, Reinhard
AU - Wegner, Sebastian
AU - Šepelák, Vladimir
AU - Heitjans, Paul
PY - 2010
Y1 - 2010
N2 - The mechanosynthesis of highly pure nanocrystalline BaLiF3 is reported. The product with mean crystallite diameter of about 30 nm was prepared by joint high-energy ball-milling of the two binary fluorides LiF and BaF2 at ambient temperature. Compared to coarse-grained BaLiF3 with µm-sized crystallites, which is available via conventional solid-state synthesis at much higher temperatures, the mechanosynthesized product exhibits a drastic increase of ionic conductivity by several orders of magnitude. This is presumably due to structural disorder introduced during milling and to the presence of a large volume fraction of interfacial regions in the nanocrystalline form of BaLiF3 providing fast diffusion pathways for the charge carriers. Starting from mechanosynthesized nanocrystalline BaLiF3 it is possible to tune the transport parameters in a well defined way by subsequent annealing. Changes of the electrical response of mechanosynthesized BaLiF3 during annealing are studied in situ by impedance spectroscopy. The results are compared with those of a structurally well-ordered single crystal which clearly shows extrinsic and intrinsic regions of ionic conduction.
AB - The mechanosynthesis of highly pure nanocrystalline BaLiF3 is reported. The product with mean crystallite diameter of about 30 nm was prepared by joint high-energy ball-milling of the two binary fluorides LiF and BaF2 at ambient temperature. Compared to coarse-grained BaLiF3 with µm-sized crystallites, which is available via conventional solid-state synthesis at much higher temperatures, the mechanosynthesized product exhibits a drastic increase of ionic conductivity by several orders of magnitude. This is presumably due to structural disorder introduced during milling and to the presence of a large volume fraction of interfacial regions in the nanocrystalline form of BaLiF3 providing fast diffusion pathways for the charge carriers. Starting from mechanosynthesized nanocrystalline BaLiF3 it is possible to tune the transport parameters in a well defined way by subsequent annealing. Changes of the electrical response of mechanosynthesized BaLiF3 during annealing are studied in situ by impedance spectroscopy. The results are compared with those of a structurally well-ordered single crystal which clearly shows extrinsic and intrinsic regions of ionic conduction.
UR - http://www.scopus.com/inward/record.url?scp=77956548275&partnerID=8YFLogxK
U2 - 10.1039/c004530f
DO - 10.1039/c004530f
M3 - Article
C2 - 20714496
AN - SCOPUS:77956548275
VL - 12
SP - 11251
EP - 11262
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 37
ER -