Tantalaeschynite-(Eu) Jacobsen H, Lissner F, Manek E, Meyer G Zeitschrift fur Kristallographie 211 (1996) 547-548 Crystal structures of dieuropium(II) ditantalum heptoxide, Eu2Ta2O7 and europium(II) ditantalum hexoxide, EuTa2O6 Locality: Synthetic _database_code_amcsd 0018933 11.02 7.640 5.610 90 90 90 Pnma atom x y z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Eu .0402 .25 .5387 .0140 .0087 .0136 0 .0010 0 Ta .14237 .99594 .0377 .0082 .0080 .0119 .0000 .0002 .0000 O1 .974 .035 .221 .016 .008 .016 .000 .002 -.002 O2 .214 .048 .361 .010 .008 .016 -.001 .002 -.004 O3 .144 .25 .967 .03 .007 .016 0 .004 0 O4 .372 .25 .643 .019 .002 .017 0 .000 0