Tapiolite-(Fe) von Heidenstam O Arkiv for Kemi 28 (1968) 375-387 Neutron and X-ray diffraction studies on tapiolite and some synthetic substances of trirutile structure Note: Crystal A Note: Stalex diffractometer _database_code_amcsd 0017872 4.7515 4.7515 9.254 90 90 90 P4_2/mnm atom x y z occ Biso Fe 0 0 0 1.0 Nb 0 0 .335 .10 1.0 Ta 0 0 .335 .90 1.0 O1 .303 .303 0 .6 O2 .300 .300 .335 .8