High-energy ball milling-a possible synthesis route for cryolite and chiolite

Publikationstyp
Journal Article
Date Issued
2006-06-01
Sprache
English
Author(s)
Scholz, Gudrun
Korup, Oliver  
TORE-URI
https://hdl.handle.net/11420/46075
Journal
Solid state sciences  
Volume
8
Issue
6
Start Page
678
End Page
684
Citation
Solid State Sciences 8 (6): 678-684 (2006-06-01)
Publisher DOI
10.1016/j.solidstatesciences.2006.02.036
Scopus ID
2-s2.0-33747383082
ISSN
12932558
Mixtures of powders of crystalline sodium fluoride together with crystalline or amorphous aluminium fluoride were mechanically treated at ambient temperature by high-energy ball milling using a planetary mill. The application of X-ray powder diffraction together with 19F and 27Al MAS NMR spectroscopy gave unambiguous evidence that solid state chemical reactions between NaF and AlF3 take place at mechanical milling. Dependent on the molar ratio of the educts cryolite (Na3AlF6) and/or chiolite (Na5Al3F14) are obtained as reaction products. Moreover, the state of order of the educts, here crystalline or amorphous aluminium fluoride, has a strong influence on the reaction products formed.
Subjects
Chiolite
Cryolite
MAS NMR
Mechanochemistry
XRD
DDC Class
600: Technology