inorganic compounds
The structure of the cubic phase of langbeinite-type Tl2Cd2(SO4)3 at 295 K has been refined from X-ray diffraction data. The bond valence sums of the monovalent cations show anomalous low values, indicating that some Tl atoms are very loosely bonded. The possible relevance of this result in the phase-transition scheme of compounds similar to Tl2Cd2(SO4)3 is discussed.