Crystal structure and characteristics of the formation of vibrational spectra

Authors

  • Д. И. Блецкан Uzhgorod National University, Ukraine
  • Ю. В. Ворошилов Uzhgorod National University, Ukraine
  • Л. М. Дурдинец Uzhgorod National University, Ukraine
  • П. П. Мигалко Uzhgorod National University, Ukraine
  • В. А. Стефанович Uzhgorod National University, Ukraine
  • В. Н. Кабаций Uzhgorod National University, Ukraine

DOI:

https://doi.org/10.24144/2415-8038.1999.5.163-169

Keywords:

Crystal structure, formation features, spectra

Abstract

Pb2GeS4 crystals were obtained by the method of directional solidification from the Bridgman-Stockbarger melt. With the help of X-ray diffraction analysis, their affiliation to the monoclinic syngonia was confirmed, etc. ip. P2, s. The main structural elements of Pb<sub>2</sub>GeS<sub>4</sub> are isolated tetrahedrons [GeS4], linked to each other by Pb<sup>2+</sup> cations

Using the methods of long-wavelength IR and Raman spectroscopy, it was possible to obtain almost complete spectral information (mode frequencies and their polarization properties) on the vibrational states corresponding to the optical phonons of the center of the Brillouin zone. For optical phonons of the Pb<sub>2</sub>GeS<sub>4</sub> crystal, a complete correspondence was obtained between the number of observed bands and their polarization properties with the predictions of group-theoretical analysis for a crystal structure containing elements of the [GeS4] tetrahedra type whose symmetry parameters are known from X-ray data.

References

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Попович 3.B. Колебательные свойства монокристаллического PbGeS3. // ФТП. 1986. Т.28. №2. С.344-351.

Susa К., Steinfink Н. Ternary sulfide compounds AB2S4: the crystal structures of GePb2S4 and SnBa2S4. // J. Solid State. Chem. 1971. V.3. № 1. P. 75-82.

Блецкан Д. И., Тербан В. П., Гур-зан М.И., Поторий М.В. Получение, структура и фотоэлектрические свойства кристаллов PbGeS3 и Pb2GeS4. // Известия АН СССР. Неорган. Материалы. 1990. Т.26. № 3. С. 509-514.

Faterley W.B., McDevit N.T., Beutley F. Infrared and Raman selection rules for lattice vibrations the correlation method 11 Appl. Spectrosc. 1972. V. 25. Р. 155173.

Pohl S., Schiwy W., Weinstok N., Krebs B. Darstellung, Swingungsspek- tren und Normalkoordinatenanalyse der Ionen GeS^ und SnS*'. // Zeitschrift fur Naturforschung B. 1973. Bd.28. № 3. S. 556-569.

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Published

1999-12-31

Issue

Vol. 5 (1999)

Section

Статті

License

Copyright (c) 1999 Scientific Herald of Uzhhorod University.Series Physics

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