Na O3.5 U Gasperin M Journal of the Less-Common Metals 119 (1986) 83-90 Na2U2O7: Synthese et structure d'un monocristal _cod_database_code 1001364 _database_code_amcsd 0014158 3.911 3.911 17.857 90 90 120 R-3m atom x y z occ U1 -.0163 -.0600 .0054 .0833 Na1 0 0 .5 O1 0 0 .1048 .75 O2 .0455 -.0455 .3514 .332