Syntheses, crystal Structures and electronic Structures of new metal chalcoiodides Bi2CuSe3I and Bi6Cu3S10I

I. Chu Liang, Daniel I. Bilc, Maria Manoli, Wei Yun Chang, Wen Fu Lin, Theodora Kyratsi, Kuei-Fang Hsu

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4 Citations (Scopus)

Abstract

Two new metal chalcoiodides were synthesized by solid-state reactions at 400 °C. Crystal Data: Bi2CuSe3I, 1, monoclinic, C2/m, a=14.243(2) Å, b=4.1937(7) Å, c=14.647(2) Å, β=116.095(2)°, V=785.7(2) Å3, and Z=4; Bi6Cu3S10I, 2, orthorhombic, Pnma, a=17.476(2) Å, b=4.0078(4) Å, c=27.391(2) Å, V=1918.5(3) Å3, and Z=4. Compound 1 adopts a three-dimensional structure formed by two alternative layers, which consist of BiSe5 square pyramids, BiSe4I2 octahedra, CuSe4 tetrahedra, and CuSe2I2 tetrahedra. Compound 2 possesses a new open framework built up of BiS5 square pyramides, BiS6 octahedra, BiS8 polyhedra, and CuS4 tetrahedra where I- anions are uniquely trapped within the tunnels. Both electronic structures reveal that bismuth and chalcogenide orbitals dominate the bandgaps. The Cu d and I p states contribute to the top of valence bands, in which the distribution of I orbitals may correspond to the relative bonding interactions in 1 and 2. The optical bandgaps determined by the diffuse reflectance spectra are 0.68 eV and 0.72 eV for 1 and 2, respectively. 1 is a p-type semiconductor with high Seebeck coefficients of 460-575 μV/K in the temperature range of 300-425 K. The electrical conductivity is 0.02 S/cm at 425 K for the undoped sample. The thermal conductivity is 0.22 W/mK at 425 K.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalJournal of Solid State Chemistry
Volume234
DOIs
Publication statusPublished - 2016 Feb 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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