Mass Spectrometric Study of the Vaporization of LiF, NaF, and LiF–NaF Mixtures

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Abstract
Vapors effusing from Knudsen cells containing LiF, NaF, and LiF–NaF mixtures have been analyzed mass spectrometrically. The over‐all temperature range studied is between 900 and 1150°K. Monomers, dimers, and trimers of LiF and NaF are observed. The LiF system has the higher concentration of dimers and trimers. In the LiF–NaF system at 50 mole percent LiF the mixed dimer, LiNaF2, is the major polymeric vapor species. Thermochemical data for LiF(g), NaF(g), Li2F2(g), Na2F2(g) and Li3F3(g) have been obtained. For the reaction Li2F2(g)+Na2F2(g)=2LiNaF2(g), ΔH° is approximately zero.

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