AM_Neptunium-beta Formula: Np Name: Neptunium-beta Unit cell: 4.897 4.897 3.388 90.0 90.0 90.0 , V=81.25 Space group: P4212 (90)

Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York, Sample is stable between 551 K and 843 K, Note: T = 586 K