Ba2 Cu3 O6.91 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 1008394 _database_code_amcsd 0016303 3.8148 3.8815 11.6681 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 .1848 .51 .51 .51 0 0 0 Y1 .5 .5 .5 .38 .38 .38 0 0 0 Cu1 0 0 0 .40 .40 .40 0 0 0 Cu2 0 0 .3551 .38 .38 .38 0 0 0 O1 0 0 .1588 .67 .67 .67 0 0 0 O2 .5 0 .3784 .56 .56 .56 0 0 0 O3 0 .5 .3777 .47 .47 .47 0 0 0 O4 .0307 .5 0 .455 .59 .59 .59 0 0 0