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• W2021982783 abstract "${}^{207}mathrm{Pb},$ ${}^{45}mathrm{Sc},$ and ${}^{93}mathrm{Nb}$ nuclear-magnetic-resonance (NMR) spectra of partially ordered relaxor ferroelectric ${mathrm{PbSc}}_{1/2}{mathrm{Nb}}_{1/2}{mathrm{O}}_{3}$ (PSN) have been studied at temperatures between 77 K and 420 K. The relatively narrow ${}^{45}mathrm{Sc}$ and ${}^{207}mathrm{Pb}$ NMR spectral components, arising from chemically ordered regions of the crystal, show marked anomalies at ${T}_{c}ensuremath{simeq}$ 360 K, where ${T}_{c}$ is the temperature of the dielectric susceptibility maximum. The abrupt frequency shifts of these components below ${T}_{c}$ are related to the first-order structural phase transition. In the coexisting broad spectral components, originating from compositionally disordered regions, such anomalies are barely detectable; they were not observed at all in the ${}^{93}mathrm{Nb}$ NMR spectra. Our NMR data are compatible with an assumption of large, up to 0.04 nm, displacements of lead ions and smaller, $ensuremath{sim}0.01mathrm{nm},$ displacements of scandium ions along the four polar rhombohedral axes, while Nb ions remain in the centers of oxygen octahedra. ${}^{207}mathrm{Pb}$ NMR measurements in poled crystals reveal that long-range polar ordering is established solely in the chemically ordered parts of the crystal, whereas in the disordered regions a mixed ferro-glass order sets in. At low temperatures, both ${}^{207}mathrm{Pb}$ and ${}^{93}mathrm{Nb}$ resonances detect, in addition to the ferroelectric rhombohedral, a tetragonal distortion of the PSN lattice. This distortion appears at ${T}_{c}$ and increases smoothly on decreasing temperature, possessing a second-order phase-transition character. The effective local symmetry of PSN at $T<250mathrm{K}$ thus lowers from the axial rhombohedral to the nonaxial orthorhombic with lead atom shifts deviating considerably from the [111] polar axes. Structural data, obtained via NMR, are compared with similar data obtained from neutron and x-ray-diffraction experiments." @default.
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• W2021982783 date "2004-02-11" @default.
• W2021982783 modified "2023-10-18" @default.
• W2021982783 title "NMR study of ionic shifts and polar ordering in the relaxor ferroelectric<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi mathvariant=normal>Pb</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sc</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Nb</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo…" @default.
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• W2021982783 doi "https://doi.org/10.1103/physrevb.69.054103" @default.
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