Abstract
The crystal structure of γ-In2Se3(P61orP65,Z= 6,a= 712.86(5),c= 1938.1(2) pm) was redetermined by X-ray structure determination methods confirming the results of Likformanet al.reported in 1978 (8). The crystals (hexagonal pyramids and bipyramids, and small plates) obtained by chemical transport with iodine as transporting agent were multiple twins. The collected data of two twinned crystal specimens were refined (finalR1 = 0.0315 and 0.0559 for 1553 and 1602 independent reflections withI> 2σI, respectively). The structure is built up by In(1)Se5trigonal bipyramids and distorted In(2)Se4tetrahedra resulting in a distorted wurtzite-type-like arrangement. γ-In2Se3is the room-temperature polymorph of indium(III) selenide contrary to some other reports in the literature, e.g., Julienet al.(1985) (3).
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