The noncentrosymmetric chain compounds, A3M2AsSe 11 (A = K, Rb, Cs; M = Nb, Ta)

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Abstract

The noncentrosymmetric niobium and tantalum selenoarsenates, A 3Nb2AsSe11 (A=K, Rb, Cs) and K 3Ta2AsSe11, were synthesized in a polyselenoarsenate flux. All compounds crystallize in the polar monoclinic space group Cc. The structures are comprised of the same type of infinite chain anions, [M2Se2(Se2)3(AsSe 3)]3- (M=Nb, Ta) separated by alkali metal cations. The As3+ centers with nonbonded electron pairs play an important role in stabilizing the noncentrosymmetric structures. UV-Vis spectroscopy, Raman spectroscopy and differential thermal analysis data are reported. The energy gaps of these compounds vary between 1.35 and 1.53eV.

Original languageEnglish
Pages (from-to)41-49
Number of pages9
JournalJournal of Alloys and Compounds
Volume381
Issue number1-2
DOIs
Publication statusPublished - Nov 3 2004

Keywords

  • Flux synthesis
  • Non linear optical piezoelectricity
  • Non-oxide materials

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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