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Messung der elastischen und inelastischen Streuanteile im Bereich der Bragg‐Reflexe eines Pentaerythrit‐Einkristalls mit Hilfe von Mössbauer‐Quelle und ‐Absorber
Author(s) -
Bärnighausen E.
Publication year - 1978
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889878013205
Subject(s) - debye model , phonon , physics , condensed matter physics , bragg's law , mössbauer spectroscopy , anisotropy , debye , optics , diffraction , materials science , nuclear physics
Measurements of thermal diffuse scattering (TDS) based on a Mössbauer diffraction method are given for 11 Bragg reflexions of pentaerythritol. The experimental values are in a good agreement with the Debye–Waller–Faxén theory provided that the elastic constants of pentaerythritol reported by Haussühl [private communication (1976)] are used and not those of Srivastava [ Acta Cryst. (1962). 15 , 1306]. This demonstrates the validity of the Debye–Waller–Faxén theory for a molecular crystal of non‐cubic symmetry. The influence of phonon dispersion, two‐phonon scattering, instrumental broadening, extinction and elastic anisotropy is discussed. A simple experimental TDS correction for X‐ray Bragg intensities is suggested.