Phase equilibria and structure in the Na3AlF6-Na2B4O7-TiO2

E. M. Anghel, E.Α. Pavlatou, M. Balasoiu, S. Zuca

High Temperature Material Processes (2000), 4 (3), 431-440

As part of the ternary system Na3AlF6-Na2B4O7-TiO2, the binary subsystem: Na2B4O7TiO2 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 >85wt.% Na2B4O7 of the Na2B4O7-[Na3AlF6TiO2](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.

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