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crystal data
Two forms of PuOs2 have been observed. One is hexagonal with a0 ~ 5.34, c0 ~ 8.68 Å, space group P63/mmc, structure type C14, structure example MgZn2. The other is cubic with a0 ~ 7.53 Å, space group Fd3m, structure type C15, structure example MgCu2. Powder data are given. As the time of homogenization at elevated temperature increases, the lattice parameters approach stable values.