The role of polar-nanoregions in KTa1-xNbxO3 single crystals studied by Raman scattering

The dynamical properties of KTa 1- x Nb x O 3 (x = 0.40) crystals were investigated by Raman scattering. The remarkable change of the central peak (CP) intensity was observed in the vicinity of T C . The physical origin of the CP in the cubic phase caused by the fluctuating polar nanoregions (PNRs)...

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Bibliographic Details
Published inFerroelectrics Vol. 503; no. 1; pp. 85 - 93
Main Authors Rahaman, Md. Mijanur, Imai, Tadayuki, Sakamoto, Tadashi, Tsukada, Shinya, Kojima, Seiji
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis 20.10.2016
Taylor & Francis Ltd
Subjects
Ferroelectrics
KTN
Perovskite
polar nanoregions
Raman scattering
Scattering
Single crystals
Symmetry
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Summary:The dynamical properties of KTa 1- x Nb x O 3 (x = 0.40) crystals were investigated by Raman scattering. The remarkable change of the central peak (CP) intensity was observed in the vicinity of T C . The physical origin of the CP in the cubic phase caused by the fluctuating polar nanoregions (PNRs) with A 1 (z) symmetry was discussed using the results of the angular dependence of Raman scattering. The phase difference between different Raman tensor components related to PNRs with the A 1 (z) symmetry was observed. The local symmetry breaking in the cubic phase was discussed on the basis of the evolution of the PNRs.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2016.1216699