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 1008415 _database_code_amcsd 0016324 3.8108 3.8789 11.6328 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 .32 .32 .32 0 0 0 Y1 .5 .5 .5 .33 .33 .33 0 0 0 Cu1 0 0 0 .38 .38 .38 0 0 0 Cu2 0 0 .3555 .25 .25 .25 0 0 0 O1 0 0 .1598 .53 .53 .53 0 0 0 O2 .5 0 .3781 .38 .38 .38 0 0 0 O3 0 .5 .3773 .40 .40 .40 0 0 0 O4 .0279 .5 0 .43 .24 .24 .24 0 0 0