Details
| Original language | English |
|---|---|
| Pages (from-to) | 960-966 |
| Number of pages | 7 |
| Journal | Zeitschrift fur Anorganische und Allgemeine Chemie |
| Volume | 639 |
| Issue number | 6 |
| Publication status | Published - May 2013 |
Abstract
Simple mixing or shaking of alkaline earth hydroxides with ammonium fluoride results in nanocrystalline phase pure metal fluorides MF2 (M: Ca, Sr, Ba). The formation of the alkaline earth fluorides was investigated by varying the reaction conditions. Evidence was found that just the contact between the starting materials is sufficient for the reaction to take place. X-ray diffraction, elemental analysis, 19F MAS NMR spectroscopy, and measurements of DC conductivities were used to characterize the fluorides regarding properties like crystal structure, crystallite sizes, local fluorine coordination, and fluorine ion conductivity. The 19F MAS NMR spectra of the phase pure fluorides prepared showed several signals, which were assigned to defects, impurities, or geometric distortions. The fluorides prepared by mixing or shaking revealed fluorine ion conductivities several orders of magnitude higher than observed for the respective microcrystalline alkaline earth fluorides. Therefore, the synthesis routine presented in this study may open a path to a very quick and simple synthesis of nanocrystalline fast fluorine ion conductors.
Keywords
- F MAS NMR spectroscopy, Fluorine, Fluorine ion conductivity, Nanocrystalline alkaline earth fluorides
ASJC Scopus subject areas
- Chemistry(all)
- Inorganic Chemistry
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In: Zeitschrift fur Anorganische und Allgemeine Chemie, Vol. 639, No. 6, 05.2013, p. 960-966.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Fast ion conducting nanocrystalline alkaline earth fluorides simply prepared by mixing or manual shaking
AU - Scholz, Gudrun
AU - Meyer, Klas
AU - Düvel, Andre
AU - Heitjans, Paul
AU - Kemnitz, Erhard
PY - 2013/5
Y1 - 2013/5
N2 - Simple mixing or shaking of alkaline earth hydroxides with ammonium fluoride results in nanocrystalline phase pure metal fluorides MF2 (M: Ca, Sr, Ba). The formation of the alkaline earth fluorides was investigated by varying the reaction conditions. Evidence was found that just the contact between the starting materials is sufficient for the reaction to take place. X-ray diffraction, elemental analysis, 19F MAS NMR spectroscopy, and measurements of DC conductivities were used to characterize the fluorides regarding properties like crystal structure, crystallite sizes, local fluorine coordination, and fluorine ion conductivity. The 19F MAS NMR spectra of the phase pure fluorides prepared showed several signals, which were assigned to defects, impurities, or geometric distortions. The fluorides prepared by mixing or shaking revealed fluorine ion conductivities several orders of magnitude higher than observed for the respective microcrystalline alkaline earth fluorides. Therefore, the synthesis routine presented in this study may open a path to a very quick and simple synthesis of nanocrystalline fast fluorine ion conductors.
AB - Simple mixing or shaking of alkaline earth hydroxides with ammonium fluoride results in nanocrystalline phase pure metal fluorides MF2 (M: Ca, Sr, Ba). The formation of the alkaline earth fluorides was investigated by varying the reaction conditions. Evidence was found that just the contact between the starting materials is sufficient for the reaction to take place. X-ray diffraction, elemental analysis, 19F MAS NMR spectroscopy, and measurements of DC conductivities were used to characterize the fluorides regarding properties like crystal structure, crystallite sizes, local fluorine coordination, and fluorine ion conductivity. The 19F MAS NMR spectra of the phase pure fluorides prepared showed several signals, which were assigned to defects, impurities, or geometric distortions. The fluorides prepared by mixing or shaking revealed fluorine ion conductivities several orders of magnitude higher than observed for the respective microcrystalline alkaline earth fluorides. Therefore, the synthesis routine presented in this study may open a path to a very quick and simple synthesis of nanocrystalline fast fluorine ion conductors.
KW - F MAS NMR spectroscopy
KW - Fluorine
KW - Fluorine ion conductivity
KW - Nanocrystalline alkaline earth fluorides
UR - http://www.scopus.com/inward/record.url?scp=84878169918&partnerID=8YFLogxK
U2 - 10.1002/zaac.201300083
DO - 10.1002/zaac.201300083
M3 - Article
AN - SCOPUS:84878169918
VL - 639
SP - 960
EP - 966
JO - Zeitschrift fur Anorganische und Allgemeine Chemie
JF - Zeitschrift fur Anorganische und Allgemeine Chemie
SN - 0044-2313
IS - 6
ER -