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The compounds Ce2O2S, La2O2S and Pu2O2S are isostructural, with one stoichiometric molecule per hexagonal unit cell. The unit-cell dimensions for the prototypic compound Ce2O2S are a1 = 4.00 ± 0.01 kX.; a3 = 6.82 ± 0.03 kX. The space group is C{\overline 3}m and the atomic positions are: 2 Ce in ± (1/3, 2/3, u1), with u1 = 0.29 ± 0.02; 1 S in (0, 0, 0); 2 O in ±(1/3, 2/3, u2), with u2 = 0.64. The structure is closely related to that of Ce2O3 (D52 type).
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