DETERMINATION OF ACTIVITIES IN MELTED NaF-AlF_3 SYSTEM

Acta Metall Sin

1994, Vol. 30

Issue (17): 199-203 DOI:

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DETERMINATION OF ACTIVITIES IN MELTED NaF-AlF_3 SYSTEM

XIE Gang; SONG Ning(Kunming Institute of Technology)

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XIE Gang; SONG Ning(Kunming Institute of Technology). DETERMINATION OF ACTIVITIES IN MELTED NaF-AlF_3 SYSTEM. Acta Metall Sin, 1994, 30(17): 199-203.

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Abstract In equilibrium with NaF-AlF3 melts,the Na activities in Al was determined by EMF with β-Al2O3 solid electrolyte.The electrochemical cell can be represented by Na（Al)｜Na＋β－Al2O3｜（α＋β）－Al2O3The Na activitiesobtained were used to calculate the activities of NaF and AlF3, in the NaF-AlF3 system from different temperature and mole ratio of the melts. The activity of NaF may increase and of AlF3 decrease with the increase of NaF／AlF3 mole ratio in the melt or the increase of temperature.

Key words: NaF-AlF_3 melt activity cell solid electrolyte

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