Abstract
Based on polarization measurements of the low-frequency Raman spectra of p-bromochlorobenzene and calculations of the frequency spectra of lattice vibrations by the Dean method it is shown that the structure may contain vacancies. Their presence affects the appearance of additional lines in the low-frequency spectrum, particularly in the vicinity of 70 cm−1, and their positions depend weakly on the orientational disorder of the molecules with respect to the para substituents. The activation energies for diffusion in a randomly disordered p-bromochlorobenzene crystal with vacancies in the structure is calculated from atom-atom potentials. It is shown that the value of the activation energy varies along a selected direction and depends on the arrangement of the p-bromochlorobenzene molecules with respect to the para substituents, in contrast to the results for ordered p-dibromobenzene and p-dichlorobenzene.
Similar content being viewed by others
References
New Physical Principles of the Optical Processing of Information, edited by S. A. Akhmanov and M. A. Vorontsov [in Russian], Moscow (1990), p. 399.
H. M. Gibbs, Optical Bistability: Controlling Light with Light, Academic Press, Orlando (1985); Mir, Moscow (1988).
V. F. Shabanov and M. A. Korshunov, Fiz. Tverd. Tela (St. Petersburg) 37, 3463 (1995) [Phys. Solid State 37, 1902 (1995)].
A. I. Kitaigorodskii, X-Ray Structural Analysis [in Russian], Moscow (1950), 650 pp.
V. S. Grechishkin, Nuclear Quadrupole Coupling in Solids [in Russian], Nauka, Moscow (1973), 263 pp.
M. B. Wincke, A. Hadni, and X. Gerbaux, J. Phys. (Paris) 31, 893 (1970).
A. I. Kitaigorodskii, Molecular Crystals [in Russian], Moscow (1971), 424 pp.
P. Dean, Rev. Mod. Phys. 44, 127 (1972).
Author information
Authors and Affiliations
Additional information
Fiz. Tverd. Tela (St. Petersburg) 40, 1835–1838 (October 1998)
Rights and permissions
About this article
Cite this article
Shabanov, V.F., Korshunov, M.A. Migration of molecules in p-bromochlorobenzene with vacancies in its structure. Phys. Solid State 40, 1664–1666 (1998). https://doi.org/10.1134/1.1130630
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1134/1.1130630