Abstract
Three new compounds have been added to the alkali chalcogenide and oxychalcogenide families: Sr2O2Bi2Se3, Ba2O2Bi2Se3, and Sr2O2Sb2Se3 were synthesized by direct combination of SrO or BaO with Bi2Se3 or Sb2Se3. The structure, determined from laboratory X-ray powder diffraction data, consists of double chains of edge-sharing BiSe4O square pyramids. Temperature-dependent resistance data reveal all three compounds to be insulators, while heat capacity data of Ba2O2Bi2Se3 and Sr2O2Bi2Se3, in conjunction with the literature reports, reveal low energy phonon modes due to bismuth lone pair effects. We propose a specific materials design principle connecting electron count to structural dimensionality by comparison to related chalcogenides, including the BiS2 superconductors.
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