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Phase Analysis of the Binary System of Cryolite (Na 3 AlF 6 ) and Sodium Metasilicate (Na 2 SiO 3 )
Author(s) -
Šimko František,
Boča Miroslav
Publication year - 2007
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200790160
Subject(s) - cryolite , chemistry , eutectic system , thermal analysis , phase (matter) , sodium , aluminosilicate , sodium aluminosilicate , amorphous solid , binary system , phase diagram , inorganic chemistry , analytical chemistry (journal) , nuclear chemistry , crystallography , thermal , aluminium , binary number , thermodynamics , chromatography , organic chemistry , catalysis , microstructure , physics , arithmetic , mathematics
The phase analysis of cryolite (Na 3 AlF 6 ) and sodium metasilicate (Na 2 SiO 3 ) was performed by thermal analysis. The eutectic system with a region of two immiscible substances at a concentration of Na 2 SiO 3 between 42.8 and 46.3 mol‐% was identified and the eutectic temperature determined to (886±2) °C. Based on the results of mass‐loss measurements, it was assumed that the introduced Na 2 SiO 3 reacts with Na 3 AlF 6 due to the formation of some nonvolatile stable compounds. The stable reaction products were identified by X‐ray diffraction analysis and IR spectroscopy of the spontaneously cooled samples, which established the formation of NaF and stable amorphous aluminosilicate compounds.