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 1008418 _database_code_amcsd 0016327 3.8180 3.8835 11.6726 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 .1857 .65 .65 .65 0 0 0 Y1 .5 .5 .5 .54 .54 .54 0 0 0 Cu1 0 0 0 .59 .59 .59 0 0 0 Cu2 0 0 .3560 .50 .50 .50 0 0 0 O1 0 0 .1592 .80 .80 .80 0 0 0 O2 .5 0 .3782 .65 .65 .65 0 0 0 O3 0 .5 .3777 .62 .62 .62 0 0 0 O4 .0377 .5 0 .43 .58 .58 .58 0 0 0