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The crystal structure of PuNi 3 and CeNi 3

1959; Wiley; Volume: 12; Issue: 9 Linguagem: Inglês

10.1107/s0365110x59002006

1600-8642

D. T. Cromer, C. E. Olsen,

Rare-earth and actinide compounds

The structure of 1)u_Ni 3 and the structure and composition of CeNi 3 have been determined by single crystal X-ray methods.Pul~i 3 has three formula units in a rhombohedral unit cell with a = 6.22A and a = 33 ° 44', probable space group R3m.CeNi 3 has six formula units in a hexagonal cell with a=4.98 and c=16.54A, probable space group P63/mmc.These structures are both derived from stacking single layers of the MNi 5 structure (CaCus-type) and double layers of the MNi~ structure (Cu~Mg-type).* Work performed under the auspices of the Atomic Energy Commission. nickel phase diagram, published originally by Wensch & Whyte (1951), shows the existence of the compounds PuNi, PuNi2, PuNis, PuNi4, PuNi5 and Pu2Ni17.The structures of PuNi2, PuNi5 and Pu2Nil~ have been reported in a review by Coffinberry & Ellinger (1956) to be of the Cu2Mg, CaCu5 and Th2Ni17 structure types, respectively.Vogel (1947), in a study of the ceriumnickel phase diagram, lists the compounds Ce3Ni, 46*