The phase equilibrium diagram for the ternary fused‐salt system NaF–BeF2–UF4 was based on evidence from differential thermal analysis, polarized light microscopy, and X‐ray examination of samples obtained from thermal‐gradient quenching studies and from high‐temperature filtration experiments. All the stable compounds in the binary systems NaF–BeF2 and NaF–UF4 displayed primary‐phase fields in the ternary system, including a new subsolidus compound which was observed and tentatively assigned the formula NaF · 4UF4. No ternary compounds or solid solutions were observed. The following three eutectics were found in the ternary system: (1) 72.5 NaF, 17.0 BeF2, and 0.5 mole % UF4 at 486°C, (2) 56.0 NaF, 43.5 BeF2, and 10.5 mole % UF4 at 339°C, and (3) 43.5 NaF, 56.0 BeF2, and 0.5 mole % UF4 at 345°C.
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