Citations:hexafluorides


 * 1990, G. Meyer, Lester R. Morss, Synthesis of Lanthanide and Actinide Compounds, Springer Science & Business Media (ISBN 9780792310181), 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 &lt; NpF6  &lt; UF6, but NpF6 is anomalous in possessing higher volatility in the solid state.