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Mössbauer Effect Studies of Lattice-Dynamic Anisotropy and Line Asymmetry in Semiconductor and Organometallic Tin Compounds

  • Hans A. Stöckler
  • Hirotoshi Sano

Abstract

The lattice-dynamic anisotropy in double-layer molecules of stannous sulfide and dioctyltinoxide was investigated in the temperature range 60–320°K by observing the Karyagin effect in Mössbauer doublet spectra. It was found that in molecules with a two-dimensional polymeric network the motion of the Mössbauer atom is largest in the direction perpendicular to the plane of the extended layer, and that the lattice-dynamic anisotropy increases at higher temperatures. The “polymer effect” enhances the recoilless fraction by restricting the motion of the molecule in the direction of the polymer bonding. An analysis for the evaluation of absolute values of the recoilless fraction has been outlined. It has long been recognized that many group Iva/VIa binary compounds have characteristic semiconducting properties. In particular, PbS, PbSe, PbTe, and SnTe, with regular rock-salt structures, are some of the more well-known infrared-sensitive photoconductors. Another prominent set of binary compounds belonging to this group is the series GeS, GeSe, SnS, and SnSe. This series of isomorphous semiconductors crystallizes in a distorted NaCl structure forming a puckered double-layer molecule with a pseudotetragonal array that extends infinitely in two dimensions perpendicular to the crystal c axis. The crystal structures of GeS, GeSe, SnS, and SnSe indicate that the most probable space group is D 2h 16 Pcmn and that the stereochemistry of this series is closely analogous to that of black phosphorus. It is shown that stannous selenide is lattice-dynamically and electronically isomorphous with stannous sulfide. The observed lattice-dynamic anisotropy in both SnS and SnSe would contribute to the anisotropic semiconducting behavior in these materials. It is suggested that a rigid-body treatment as applied to a layer-type structure could be extended to include the motion of atoms on the surface of small particles. A Thirring expansion analysis is used to determine the frequency moment in the high-temperature limit for SnS. Analysis of the “effective mass” of electrons and atoms in stannous sulfide is given.

Keywords

Isomer Shift Quadrupole Splitting Mossbauer Spectrum Black Phosphorus Frequency Moment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1970

Authors and Affiliations

  • Hans A. Stöckler
    • 1
  • Hirotoshi Sano
    • 2
  1. 1.Department of Chemical PhysicsNational Lead Company Research LaboratoriesHightstownUSA
  2. 2.Department of ChemistryOchanomizu UniversityTokyoJapan

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