Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 32-41 |
| Seitenumfang | 10 |
| Fachzeitschrift | Solid state sciences |
| Jahrgang | 50 |
| Publikationsstatus | Veröffentlicht - 1 Dez. 2015 |
Abstract
The capability of mechanochemical synthesis for the formation of MgF2-MF2 (M: Ca, Sr, Ba) composites, solid solutions or well-defined compounds was tested applying a fluorination of different fluorine-free metal sources with NH4F directly at milling. No evidence was found for a substitution of Mg2+ with Ca2+ (Sr2+, Ba2+) ions, or vice versa, in rutile or fluorite structure. However, an equimolar ratio of Mg2+ to the second cation allows the mechanochemical synthesis of tetrafluoromagnesates, MMgF4, which is more and more hampered the smaller the radius of the cation M2+ is. BaMgF4 is formed even phase pure from the acetates, SrMgF4 can only be observed in a mixture accompanied by the binary fluorides. In addition, 19F MAS NMR spectra along with calculations of 19F isotropic chemical shift values according to the superposition model point to the formation of a metastable phase of CaMgF4, which disappears at thermal treatment and decomposes into the binary fluorides CaF2 and MgF2.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Allgemeine Chemie
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
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in: Solid state sciences, Jahrgang 50, 01.12.2015, S. 32-41.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Mechanochemical synthesis of MgF2 - MF2 composite systems (M Combining double low line Ca, Sr, Ba)
AU - Scholz, G.
AU - Breitfeld, S.
AU - Krahl, T.
AU - Düvel, A.
AU - Heitjans, P.
AU - Kemnitz, E.
N1 - Funding Information: The authors of the Humboldt-Universität zu Berlin acknowledge the Deutsche Forschungsgemeinschaft (DFG) for financial support within the graduate school “Fluorine as key element” ( GRK 1582/2 ). P.H. and A.D. would like to thank the Deutsche Forschungsgemeinschaft (DFG) for financial support within the frame of the Priority Program SPP 1415 . Publisher Copyright: © 2015 Elsevier Masson SAS. All rights reserved.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - The capability of mechanochemical synthesis for the formation of MgF2-MF2 (M: Ca, Sr, Ba) composites, solid solutions or well-defined compounds was tested applying a fluorination of different fluorine-free metal sources with NH4F directly at milling. No evidence was found for a substitution of Mg2+ with Ca2+ (Sr2+, Ba2+) ions, or vice versa, in rutile or fluorite structure. However, an equimolar ratio of Mg2+ to the second cation allows the mechanochemical synthesis of tetrafluoromagnesates, MMgF4, which is more and more hampered the smaller the radius of the cation M2+ is. BaMgF4 is formed even phase pure from the acetates, SrMgF4 can only be observed in a mixture accompanied by the binary fluorides. In addition, 19F MAS NMR spectra along with calculations of 19F isotropic chemical shift values according to the superposition model point to the formation of a metastable phase of CaMgF4, which disappears at thermal treatment and decomposes into the binary fluorides CaF2 and MgF2.
AB - The capability of mechanochemical synthesis for the formation of MgF2-MF2 (M: Ca, Sr, Ba) composites, solid solutions or well-defined compounds was tested applying a fluorination of different fluorine-free metal sources with NH4F directly at milling. No evidence was found for a substitution of Mg2+ with Ca2+ (Sr2+, Ba2+) ions, or vice versa, in rutile or fluorite structure. However, an equimolar ratio of Mg2+ to the second cation allows the mechanochemical synthesis of tetrafluoromagnesates, MMgF4, which is more and more hampered the smaller the radius of the cation M2+ is. BaMgF4 is formed even phase pure from the acetates, SrMgF4 can only be observed in a mixture accompanied by the binary fluorides. In addition, 19F MAS NMR spectra along with calculations of 19F isotropic chemical shift values according to the superposition model point to the formation of a metastable phase of CaMgF4, which disappears at thermal treatment and decomposes into the binary fluorides CaF2 and MgF2.
KW - F MAS NMR spectroscopy
KW - BaMgF
KW - CaMgF
KW - Mechanochemical synthesis
KW - MgFeMF composites
KW - SrMgF
UR - http://www.scopus.com/inward/record.url?scp=84945970566&partnerID=8YFLogxK
U2 - 10.1016/j.solidstatesciences.2015.10.004
DO - 10.1016/j.solidstatesciences.2015.10.004
M3 - Article
AN - SCOPUS:84945970566
VL - 50
SP - 32
EP - 41
JO - Solid state sciences
JF - Solid state sciences
SN - 1293-2558
ER -