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Neutron Scattering Studies on Phase Transitions and Phonon Dispersion in CsSrCl 3
Author(s) -
Prokert F.
Publication year - 1981
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.2221040127
Subject(s) - phonon , condensed matter physics , tetragonal crystal system , neutron scattering , dispersion (optics) , phase (matter) , scattering , materials science , inelastic neutron scattering , small angle neutron scattering , dispersion relation , inelastic scattering , neutron , phase boundary , physics , optics , nuclear physics , quantum mechanics
The successive phase transitions (PT) of CsSrCl 3 which belongs to the family of the cubic perovskites of the type ABX 3 are investigated by inelastic neutron scattering. At first the acoustic phonon dispersion is measured in the cubic phase near the first PT. Outgoing there from it is possible to determine the sequence of the phonon mode condensation by evaluating the temperature dependence of the quasi‐elastic and Bragg scattering at the zone boundary points (M, R, and X). From the results of neutron scattering it is obvious that the PT into the tetragonal phase is caused by a condensation of a M 3 ‐mode and that the characterization of the successive PT's, proposed originally by Alexandrov et al. is the correct one.