An inelastic neutron scattering study of the phase transformation of RbD3(SeO3)2
- 2 February 1978
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 11 (4) , 829-835
- https://doi.org/10.1088/0022-3719/11/4/027
Abstract
The phase transition of rubidiumtrideuteroselenite RbD3 (SeO3)2 at 152K to a ferroelectric state is investigated by the inelastic scattering of neutrons. It is verified that the transformation is driven by a soft zone boundary mode (Z-point) and thus belongs to the class of improper ferroelectric transitions. The critical scattering is shown to be cigar-shaped and this corresponds to a 'valley' of the quasiharmonic dispersion surface or weakly correlated planes in real space. The weak interaction between planes can be understood by a comparison of the high and low temperature structure.Keywords
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