Synthesis and Structure of Three New Oxychalcogenides:\nA<sub>2</sub>O<sub>2</sub>Bi<sub>2</sub>Se<sub>3</sub> (A = Sr, Ba)\nand Sr<sub>2</sub>O<sub>2</sub>Sb<sub>2</sub>Se<sub>3</sub>
JessicaR. Panella (1494637)Juan Chamorro (1468126)Tyrel M. McQueen (1494640)
Abstract
Three new compounds have been added\nto the alkali chalcogenide\nand oxychalcogenide families: Sr<sub>2</sub>O<sub>2</sub>Bi<sub>2</sub>Se<sub>3</sub>, Ba<sub>2</sub>O<sub>2</sub>Bi<sub>2</sub>Se<sub>3</sub>, and Sr<sub>2</sub>O<sub>2</sub>Sb<sub>2</sub>Se<sub>3</sub> were\nsynthesized by direct combination of SrO or BaO with Bi<sub>2</sub>Se<sub>3</sub> or Sb<sub>2</sub>Se<sub>3</sub>. The structure, determined\nfrom laboratory X-ray powder diffraction data, consists of double\nchains of edge-sharing BiSe<sub>4</sub>O square pyramids. Temperature-dependent\nresistance data reveal all three compounds to be insulators, while\nheat capacity data of Ba<sub>2</sub>O<sub>2</sub>Bi<sub>2</sub>Se<sub>3</sub> and Sr<sub>2</sub>O<sub>2</sub>Bi<sub>2</sub>Se<sub>3</sub>, in conjunction with the literature reports, reveal low energy phonon\nmodes due to bismuth lone pair effects. We propose a specific materials\ndesign principle connecting electron count to structural dimensionality\nby comparison to related chalcogenides, including the BiS<sub>2</sub> superconductors.
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