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Two quaternary sulfides RE3Sb0.33SiS7 (RE=La, Pr) have been prepared from stoichiometric mixtures of elements at 1223K in an evacuated silica tube. They are the first examples of chalcogenides in the quaternary RE/Si/Sb/Q (RE=rare earth metal; Q=S, Se, Te) system. These two isostructural materials crystallize in the Ce3Al1.67S7 structure type in the hexagonal space group P63. Their structure features...
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