Cite as:
Anghel E, Balasoiu M, Zuca S, Segal E, 2001, "Phase equilibria in the NaCl -  Na₃AlF₆ - Na₂B₄O₇ - TiO₂ system" High Temperatures - High Pressures 33(4) 411 – 417

Phase equilibria in the NaCl -  Na₃AlF₆ - Na₂B₄O₇ - TiO₂ system

Elena Anghel, Marina Balasoiu, Stefania Zuca, Eugen Segal

Received 09 February 2000

Abstract. As a part of the quaternary system NaCl - Na₂B₄O₇ - Na₃AlF₆ - TiO₂, the systems NaCl - (Na₃AlF₆ - TiO₂)_e and Na₂B₄O₇ - (Na₃AlF₆ - TiO₂)_y (where e = 3.5 wt% TiO₂ and y = 3, 3.5, 5.8, 6 and 7 wt% TiO₂) were investigated by differential thermal analysis, thermogravimetry, x-ray diffraction, and infrared spectroscopy. For both systems the specific polymorphic transitions were shown, as well as the ternary eutectic transition in the case of Na₂B₄O₇ - (Na₃AlF₆ - TiO₂)_y mixtures. Additional structural information was obtained for NaCl - (Na₃AlF₆ - TiO₂)_e mixtures by infrared spectroscopy. The shift of the infrared band positions of Na₃AlF₆ towards lower wave number, when TiO₂ was added, could be due to the presence of titanium mainly in the form of (TiF₆) octahedra. The additional thermal effect registered on differential thermal analysis curves of (Na₂B₄O₇ - (Na₃AlF₆ - TiO₂)_y mixtures over the 10 - 30 wt% Na₂B₄O₇ concentration range was explained in terms of the development of a solid solution.

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