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The quaternary chalcogenides La3Sn0.5InS7 and La3Sn0.5InSe7 were prepared by reactions of the elements at 1050 °C and 950 °C, respectively. They adopt noncentrosymmetric structures [hexagonal, space group P63, Z = 2; a = 10.2993(11) Å, c = 6.0921(6) Å for La3Sn0.5InS7; a = 10.6533(7) Å, c = 6.4245(4) Å for La3Sn0.5InSe7] in which the half‐occupancy of Sn atoms within octahedral sites classifies them...
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