Details
| Original language | English |
|---|---|
| Pages (from-to) | 6238-6250 |
| Number of pages | 13 |
| Journal | Journal of Materials Chemistry |
| Volume | 21 |
| Issue number | 17 |
| Early online date | 24 Mar 2011 |
| Publication status | Published - 7 May 2011 |
Abstract
Highly metastable Ba1-xSrxLiF3 (0 < x ≤ xmax ≈ 0.4) with an inverse perovskite structure analogous to that of BaLiF3 was synthesized by soft mechanical treatment of BaF2 and LiF together with SrF2 at ambient temperature. Ex as well as in situ X-ray powder diffraction (XRPD) measurements show that heat treatment at 393 K initiates the decomposition of the mixed phase into BaLiF3, LiF and (Sr,Ba)F2. Structural details of the metastable compound (Ba,Sr)LiF3 were investigated by ultrafast 19F magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. Interestingly, five magnetically inequivalent F sites were identified which correspond to fluorine anions coordinated by a variable number of Ba and Sr cations, respectively. Details from XRPD and NMR spectroscopy are discussed with respect to the formation mechanisms and thermal stability of the as prepared fluorides. Impedance spectroscopy is used to characterize (long-range) ionic transport properties. Results are compared with those obtained recently on mechanosynthesized BaLiF3.
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Materials Chemistry
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In: Journal of Materials Chemistry, Vol. 21, No. 17, 07.05.2011, p. 6238-6250.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Access to metastable complex ion conductors via mechanosynthesis
T2 - Preparation, microstructure and conductivity of (Ba,Sr)LiF3 with inverse perovskite structure
AU - Düvel, André
AU - Wegner, S.
AU - Efimov, Konstantin
AU - Feldhoff, Armin
AU - Heitjans, Paul
AU - Wilkening, M.
PY - 2011/5/7
Y1 - 2011/5/7
N2 - Highly metastable Ba1-xSrxLiF3 (0 < x ≤ xmax ≈ 0.4) with an inverse perovskite structure analogous to that of BaLiF3 was synthesized by soft mechanical treatment of BaF2 and LiF together with SrF2 at ambient temperature. Ex as well as in situ X-ray powder diffraction (XRPD) measurements show that heat treatment at 393 K initiates the decomposition of the mixed phase into BaLiF3, LiF and (Sr,Ba)F2. Structural details of the metastable compound (Ba,Sr)LiF3 were investigated by ultrafast 19F magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. Interestingly, five magnetically inequivalent F sites were identified which correspond to fluorine anions coordinated by a variable number of Ba and Sr cations, respectively. Details from XRPD and NMR spectroscopy are discussed with respect to the formation mechanisms and thermal stability of the as prepared fluorides. Impedance spectroscopy is used to characterize (long-range) ionic transport properties. Results are compared with those obtained recently on mechanosynthesized BaLiF3.
AB - Highly metastable Ba1-xSrxLiF3 (0 < x ≤ xmax ≈ 0.4) with an inverse perovskite structure analogous to that of BaLiF3 was synthesized by soft mechanical treatment of BaF2 and LiF together with SrF2 at ambient temperature. Ex as well as in situ X-ray powder diffraction (XRPD) measurements show that heat treatment at 393 K initiates the decomposition of the mixed phase into BaLiF3, LiF and (Sr,Ba)F2. Structural details of the metastable compound (Ba,Sr)LiF3 were investigated by ultrafast 19F magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. Interestingly, five magnetically inequivalent F sites were identified which correspond to fluorine anions coordinated by a variable number of Ba and Sr cations, respectively. Details from XRPD and NMR spectroscopy are discussed with respect to the formation mechanisms and thermal stability of the as prepared fluorides. Impedance spectroscopy is used to characterize (long-range) ionic transport properties. Results are compared with those obtained recently on mechanosynthesized BaLiF3.
UR - http://www.scopus.com/inward/record.url?scp=79954432721&partnerID=8YFLogxK
U2 - 10.1039/c0jm03439h
DO - 10.1039/c0jm03439h
M3 - Article
AN - SCOPUS:79954432721
VL - 21
SP - 6238
EP - 6250
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
SN - 0959-9428
IS - 17
ER -