Figure 1
A view of the asymmetric unit of Ba2Ti2Si2O9F2, showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. Symmetry-related atoms have been added to show the octahedral environments of atoms Ti1 and Ti2. [Symmetry codes: (ii) −x + , y − , z; (iv) x + , y, −z + ; (vii) −x + , y + , z; (viii) x + , −y + , −z + 1.] |