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Neutron and Light Scattering from Ferroelectric Fluctuations and Domain Walls of Strontium Barium Niobate
Author(s) -
Prokert F.,
Schalge R.
Publication year - 1978
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.2220870121
Subject(s) - neutron scattering , scattering , materials science , rayleigh scattering , softening , small angle neutron scattering , ferroelectricity , condensed matter physics , phase transition , barium fluoride , inelastic scattering , phase (matter) , biological small angle scattering , neutron , optics , physics , nuclear physics , dielectric , optoelectronics , composite material , quantum mechanics
The mixed crystal Sr x Ba 1− x Nb 2 O 6 ( x = 0.70) is investigated in the phase transition region by inelastic neutron scattering. Softening of TO modes is not found but an additional quasi‐elastic neutron scattering (QNS) is detected, which arises mainly from a narrow central peak. This peak is also studied by Rayleigh scattering. Both methods show that the central peak consists of two parts. One part has a broad maximum at the diffuse phase transition (PT) and probably arises from phase fluctuations. The other part below the PT increases with decreasing temperature. It depends on static domain structure and the neutron scattering data can be interpreted by scattering from domain walls.