Abstract
Abstract9P‐GeSb4Te4 is a new germanium antimony telluride that can be obtained from the elements as a homogeneous phase by quenching a stoichiometric melt and subsequently annealing the sample at 500 °C. The crystal structure consists of alternating antimony layers similar to those in elemental antimony and rocksalt‐type blocks similar to those in GeSb2Te4. Although not thermodynamically stable according to the phase diagram, GeSb4Te4 is remarkably stable up to 540 °C, where it starts to melt incongruently according to DSC and DTA measurements. The crystal structure has been refined from single‐crystalX‐ray data [P$\bar{3}$m1, a = 4.2466(2) Å, c = 17.483 Å, R1 = 0.0355]. Its diffraction patterns are very similar to those of other 9P‐type tellurides like Ge2Sb2Te5 and Sb2Te, which tend to occur as very pronounced false minima in structure refinements. The electrical conductivity is low (33 S·cm–1) but exhibits metallic temperature dependence.
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