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1993 (1)
1Author    A. G. Tsarkov, V. G. TsirelsonRequires cookie*
 Title    The Identification of Phonon-Phonon Interactions in Anharmonic Crystals by X-Ray Diffraction Data  
 Abstract    The effect of anharmonic atomic vibrations on the elastic scattering of X-rays by a crystal is treated by time-independent perturbation theory. The complete expression for the anharmonic temperature factor (TF) in the high-temperature limit is presented for atoms in general positions. The phonon-phonon interactions in an anharmonic crystal may be identified with X-ray diffraction data by using various temperature and scattering vector q dependencies of different anharmonic contri-butions to the TF. The expression for the intensity of elastic scattering by an anharmonic crystal contains an additional factor -the anharmonic cross-term. This term has to be taken into account for obtaining the unbiased thermal parameters of fourth order in | q | from X-ray diffraction data. 
  Reference    Z. Naturforsch. 48a, 21—24 (1993); received November 8 1991 
  Published    1993 
  Keywords    Lattice vibrations, Anharmonicity, Phonon-phonon interactions, Temperature factor, X-ray diffraction 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0021.pdf 
 Identifier    ZNA-1993-48a-0021 
 Volume    48