| Atom | Site | x | y | z |
| Cu | 2c | 0.5 | 0 | ?0.043 |
| Ba | 2c | 0.5 | 0 | 0.255 |
| O(1) | 2a | 0 | 0 | 0 |
| O(2) | 2c | 0 | 0.5 | 0.315 |