Ba2YCu3O6.9 Williams A, Kwei G, Dreele R, Larson A, Raistrick I, Bish D Physical Review B37 (1988) 7960-7962 Joint X-ray and neutron refinement of the structure of superconducting YBa2Cu3O7-x: precision structure, anisotropic thermal parameters, strain and cation disorder _cod_database_code 1000030 _database_code_amcsd 0015238 3.82030 3.88548 11.68349 90 90 90 Pmmm atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Y .5 .5 .5 .0085 .0106 .0085 0 0 0 Ba .5 .5 .18393 .0078 .0096 .0198 0 0 0 Cu1 0 0 0 .0080 .0115 .0150 0 0 0 Cu2 0 0 .35501 .0033 .0036 .0207 0 0 0 O1 0 .5 0 .91 .0161 .0104 .0080 0 0 0 O2 .5 0 .37819 .0039 .0068 .0203 0 0 0 O3 0 .5 .37693 .0109 .0084 .0056 0 0 0 O4 0 0 .15840 .0162 .0123 .0097 0 0 0