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Using an accurate transpiration method, AlF 3 was sublimed near 1200 K into argon containing 0, 0.02, and 0.76 atm of HF, but no reaction between AlF 3 and the HF was detected within the precision (about 1%). Two alternative structures of HAlF 4 are postulated. An upper bound for extent of reaction corresponds to   Δ   H   298   ∘    &gt; - 33 kcal (- 138 kJ) for AlF 3 (g) + HF (g) = HAlF 4 (g); this indicates a far lower stability of HAlF 4 (g) than that of LiAlF 4 (g) or NaAlF 4 (g) when formed similarly.

An experimental search for gaseous reactivity between AlF3 and HF near 1200 K