Ba2 Cu3 O6.86 Y Francois M, Junod A, Yvon K, Hewat A, Capponi J, Strobel P, Marezio M, Fischer P Solid State Communications 66 (1988) 1117-1125 A study of the Cu-O chains in the high Tc superconductor Y Ba2 Cu3 O7 by high resolution neutron powder diffraction _cod_database_code 1008421 _database_code_amcsd 0016330 3.8114 3.8792 11.6373 90 90 90 Pmmm atom x y z occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Ba1 .5 .5 .1851 .36 .36 .36 0 0 0 Y1 .5 .5 .5 .34 .34 .34 0 0 0 Cu1 0 0 0 .42 .42 .42 0 0 0 Cu2 0 0 .3556 .26 .26 .26 0 0 0 O1 0 0 .1596 .55 .55 .55 0 0 0 O2 .5 0 .3780 .41 .41 .41 0 0 0 O3 0 .5 .3774 .41 .41 .41 0 0 0 O4 0 .5 0 .86 1.42 .18 .35 0 0 0