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Advances in Molten Salts

ISSN:
1-56700-142-4 (Print)

Phase equilibria and structure in the Na3AlF6-Na2B407-Ti02 system

Elena Maria Anghel
Institute of Physical Chemistry "I.G.Murgulescu" of Romanian Academy of Science, Spl. Independentei 202,77208, Bucharest, Romania

Evanghelia Pavlatou
Institute of Chemical Engineering and High Temperature Chemical Processes and Department of Chemical Engineering, University of Patras, P.O. Box 1414, Gr-265 00, Patras, Greece

Marina Balasoiu
Institute of Physical Chemistry "I.G.Murgulescu" of Romanian Academy of Science, Spl. Independentei 202,77208, Bucharest, Romania

Stefania Zuca
Institute of Physical Chemistry "I.G.Murgulescu" of Romanian Academy of Science, Spl. Independentei 202,77208, Bucharest, Romania

Abstract

As part of the ternary system Na3AlF6-Na2B4O7-TiO2, the binary subsystem: Na2B4O7-TiO2 and the pseudobinary subsystem Na2B4O7-[Na3AlF6-TiO2]e were investigated. The phase diagrams established by DTA measurements evidenced a simple eutectic point for both systems except for the concentration range > 85 wt. % Na2B4O7 of the Na2B4O7-[Na2AlF6-TiO2]e system where the binary paragenesis rules are no longer obeyed. Additional information regarding the structure of the mixtures were obtained by X-ray diffraction and Raman spectroscopy. Both vitreous and crystalline state were evidenced, without any new compound formation. The presence of titanium, mainly as TiO4 tetrahedra, was also proved.