Titre du document / Document title

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

Auteur(s) / Author(s)

SCHOLZ Gudrun ⁽¹⁾ ; KORUP Oliver ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Humboldt University of Berlin, Institute of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, ALLEMAGNE

Résumé / Abstract

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.

Revue / Journal Title

Solid state sciences   ISSN 1293-2558 

Source / Source

2006, vol. 8, n^o6, pp. 678-684 [7 page(s) (article)] (31 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Paris, FRANCE  (1999) (Revue)

Mots-clés anglais / English Keywords

Inorganic compounds ; Chiolite ; Trigonal lattices ; Cubic lattices ; Cryolite ; Ternary compounds ; Aluminium fluorides ; Sodium fluorides ; Unit cell ; Amorphous state ; Nuclear magnetic resonance ; XRD ; High energy ; Ball mill ; Experimental study ;

Mots-clés français / French Keywords

Composé minéral ; Chiolite ; Al F Na ; Na5Al3F14 ; Na3AlF6 ; Réseau rhomboédrique ; Réseau cubique ; Cryolite ; Composé ternaire ; Aluminium fluorure ; Sodium fluorure ; Maille cristalline ; Etat amorphe ; Résonance magnétique nucléaire ; Diffraction RX ; Haute énergie ; Broyeur boulet ; Etude expérimentale ;

Mots-clés espagnols / Spanish Keywords

Criolita ; Alta energía ; Molino bolas ;

Mots-clés d'auteur / Author Keywords

Mechanochemistry ; Cryolite ; Chiolite ; XRD ; MAS NMR ;

Localisation / Location

INIST-CNRS, Cote INIST : 11118, 35400011552909.0150