Physics – Condensed Matter – Materials Science
Scientific paper
2006-08-26
Physical Review B 74, 134103 (2006)
Physics
Condensed Matter
Materials Science
Accepted by PRB (2006)
Scientific paper
10.1103/PhysRevB.74.134103
We report high-resolution neutron powder diffraction on Sr0.61Ba0.39Nb2O6, SBN61, in the temperature range 15-500 K. The results indicate that the low-temperature anomalies (T<100K) observed in the dielectric dispersion are due to small changes in the incommensurate modulation of the NbO6-octahedra, as no structural phase transition of the average structure was observed. This interpretation is supported by specific heat measurements, which show no latent heat, but a glass-like behavior at low temperatures. Furthermore we find that the structural changes connected with the ferroelectric phase transition at Tc approx. 350K start already at 200K, explaining the anisotropic thermal expansion in the temperature range 200-300K observed in a recent x-ray diffraction study.
Imlau M.
Petricek Vaclav
Pomjakushin Vladimir
Schaniel D.
Schefer Juerg
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