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- W1992604855 abstract "Raman spectra of sodium niobate (NaNbO3) were obtained in all phases and revealed a significant disorder in the high-temperature U, T2 and T1 phases and ac omplicated folding of the Brillouin zone at the transitions into modulated S, R, P and N phases associated with the competitive zone-boundary soft mode s( in-phase and out-of phase octahedral tilts) along the M–T–R line. An extensive Raman study combined with x-ray diffraction (XRD) and dielectric measurements confirmed the presence of the incommensurate (INC) phase in sodium niobate. XRD experiments revealed the invar effect in the temperature interval 410–460 K corresponding to the INC phase associated with rotations of the NbO6 octahedra modulated along the b-direction. Our experiments suggest that the phase P consists of three phases: monoclinic (Pm) between 250 and 410 K, INC between 410 and 460 K, and orthorhombic (Po) between 460 and 633 K. At the low-temperature transition to the ferroelectric rhombohedral N phase all folded modes originating from the M- and T-points of the Brillouin zone abruptly disappear, Raman spectra in the N phase become much simpler and all peaks were assigned." @default.
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- W1992604855 date "2005-08-05" @default.
- W1992604855 modified "2023-10-18" @default.
- W1992604855 title "Modulated phases in NaNbO<sub>3</sub>: Raman scattering, synchrotron x-ray diffraction, and dielectric investigations" @default.
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- W1992604855 doi "https://doi.org/10.1088/0953-8984/17/33/003" @default.
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