Abstract
The ternary eutectic alloy with the composition 33 mol % NaF + 53 mol % LiF + 14 mol % NdF3 has been studied in the liquid and crystalline states using differential thermal analysis and X-ray diffraction at room and high temperatures. The results demonstrate that the alloy undergoes no phase transformations below its melting point: the only phases identified with certainty are NaF, LiF, and NaNdF4. The melt contains complex microgroups differing in cation composition. Analysis of structural models for the melt indicates that there is no dense noncrystalline packing of the fluorine anions, in contrast to what was observed previously in the eutectic NaF-LiF-LaF3 melt.
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