Comparative study of bismuth tellurites by infrared absorption spectroscopy

Zs Szaller, L. Kovács, L. Pöppl

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Abstract

Infrared spectra of α-Bi2Te4O11, β-Bi2Te4O11, Bi2Te2O7, and Bi2TeO5, have been compared and analyzed. The bands in the region of 620-400 cm-1 correspond to the stretching modes of the bismuth-oxygen framework, while those in the region of 800-620 cm-1 belong to the stretching vibrations of the Te-O bonds. TeO3 polyhedra of trigonal-pyramidal configuration with equal bond lengths (within 0.02 nm) have been found in bismuth tellurites. The largest deformation of TeO3 has been observed in Bi2TeO5 as compared to the other bismuth tellurites investigated in this study. Connected TeO3 polyhedra form Te2O5 groups in the structure of α-Bi2Te4O11. The relation between the frequency of the asymmetric stretching mode and the length of Bi-O bond is linear for Bi2TeO5 and nonlinear for α-Bi2Te4O11 and α-Bi2O3. (C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)392-396
Number of pages5
JournalJournal of Solid State Chemistry
Volume152
Issue number2
DOIs
Publication statusPublished - Jan 1 2000

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Keywords

  • Bismuth tellurium oxide
  • IR-spectra

ASJC Scopus subject areas

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

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