The description of structure and symmetry of a phonon spectrum of crystals Tl<sub>3</sub>TaS<sub>4</sub> by using the superspace symmetry concept

Authors

  • О. В. Бокотей Uzhhorod National University, Ukraine
  • І. І. Небола Uzhhorod National University, Ukraine

DOI:

https://doi.org/10.24144/2415-8038.2012.31.19-22

Keywords:

The superspace symmetry concept, Superlattice, Protocrystal

Abstract

To concepts of superspace symmetry by the example of structure of crystal Tl3TaS4 it is in details lead classification of oscillations in view of color item symmetry for all stars of wave vectors of a cubic phase (group of spatial symmetry ), the complete oscillatory image at centre of Brillouin zone and its decompositions after irreducible representations for each atom of a crystalline lattice, accordingly is received.

References

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Janssen T., Janner A. Superspace groups and representations of ordinary space groups: alternative approaches to the symmetry of incommensurate crystal phases // Physica. - 1984. - Vol. 126A. - Р. 163-176.

Небола І.І. Композиційні особливості складних кристалів та їх прояв у динаміці ґратки // Вісник Ужгородського університету. Серія Фізика. – № 2, – 1998. – С. 54-57.

P.M. de Wolff, Janssen T., Janner A. The superspace groups of incommensurate crystal structures with a one-dimensional modulation // Acta. Cryst. – 1981. – Vol. A37. – Р. 625-636.

Janssen T. On the lattice dynamics of incommensurate crystal phases // J. Phys. C: Solid State Phys. – 1979. – Vol.12. – Р. 1534 – 1543.

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Published

2012-06-30

Issue

Vol. 31 (2012)

Section

Статті

License

Copyright (c) 2012 Scientific Herald of Uzhhorod University.Series Physics

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