Cr F7 Na2 Ni Laligant Y, Ferey G, Heger G, Pannetier J Zeitschrift fur Anorganische und Allgemeine Chemie 553 (1987) 163-171 Refinement of the crystal and frustrated magnetic structures of the direct weberite Na2 Ni Cr F7 by neutron powder diffraction _cod_database_code 1000237 _database_code_amcsd 0015791 7.183 10.224 7.414 90 90 90 Imma atom x y z Na1 0 0 0 Na2 .25 .25 .75 F1 0 .25 .144 F2 0 .4120 .7265 F3 .1957 .3850 .4361 Ni1 .25 .25 .25 Cr1 0 0 .5