Citations:hexafluorides

• 1990, G. Meyer, Lester R. Morss, Synthesis of Lanthanide and Actinide Compounds, Springer Science & Business Media (→ISBN), page 85:

  The actinide hexafluorides are extremely moisture-sensitive, low melting point solids. The volatility of the three hexafluoride liquids lie in the order PuF6 < NpF6 < UF6 , but NpF6 is anomalous in possessing higher volatility in the solid state.