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Effect of the anisotropy of atomic motions on Mössbauer spectra of polycrystals
Author(s) -
Goldanskii V. I.,
Karyagin S. V.
Publication year - 1975
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220680230
Subject(s) - anisotropy , diffusion , spectral line , mössbauer spectroscopy , line (geometry) , condensed matter physics , anisotropic diffusion , orientation (vector space) , jump , materials science , physics , chemistry , geometry , crystallography , thermodynamics , optics , mathematics , quantum mechanics
Examples of anisotropic motions (vibrations, diffusion, eddy flows) are given which lead to the dependence of the shape of Mossbauer spectra on the relative orientation of the system studied (a part of a monocrystal) and the direction of observation of γ;‐rays. The anisotropy of continuous diffusion in polycrystals is found to result in different broadenings of the π and σ components. The jump diffusion is found to induce a virtually equal broadening of the π and σ components. The line shape in this case is non‐Lorentzian. Study of line shapes can give essential information on the diffusion mechanism.