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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 + [{1\over 2}], y − [{1\over 2}], z; (iv) x + [{1\over 2}], y, −z + [{1\over 2}]; (vii) −x + [{1\over 2}], y + [{1\over 2}], z; (viii) x + [{1\over 2}], −y + [{3\over 2}], −z + 1.]

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
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