Ferroelectric lithium niobate. 4. Single crystal neutron diffraction study at 24°C

Abrahams, S. C.; Hamilton, Walter C.; Reddy, J. Μ.

doi:10.1016/0022-3697(66)90073-4

Cited by 179 publications

(43 citation statements)

References 8 publications

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“…According to Abrahams et el. (Abrahams, Reddy & Bernstein, 1966;Abrahams, Hamilton & Reddy, 1966;Abrahams & Bernstein, 1967;Abrahams, Hamilton & Sequeira, 1967), the crystals LiNbO 3 and LiTaO 3 have the symmetry of the noncentrosymmetric space group…”

Section: Variation Of the Integrated Intensitiesmentioning

confidence: 99%

Electric-field-induced ionic displacement and redistribution of bonding electrons in LiNbO₃and LiTaO₃revealed by modulation X-ray diffraction

Fujimoto¹

1982

Acta Cryst Sect A

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Electric fields with alternating square wave were applied to LiNbO 3 and LiTaO 3 single crystals in [001] directions, and extremely small ionic displacement was directly detected by the measurement of the diffracted intensities of X-rays synchronously with the applied fields. The displacement of Nb and Li ions relative to the oxygen framework were found to be 4.9 x 10 -4 and 13 x 10-4]k at E = 51.5 kV cm -1 for LiNbO 3, and those of Ta and Li to be 6.8 x 10 -4 and 15 x 10 -4 A at E = 50 kV cm -1 for LiTaO 3. The temperature factor was observed to vary with the external field, which is attributed to the change in phonon frequency of the crystal lattice. It was found from the intensity variations in the lower-indexed reflections that the displacements of the bonding electrons of Nb-O and Ta--O bonds are much larger than those of the constituent ions, which may be the origin of the electrooptic effect. The capability of the modulation technique in the absolute structure determination of crystals is demonstrated.

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Section: Variation Of the Integrated Intensitiesmentioning

confidence: 99%

Electric-field-induced ionic displacement and redistribution of bonding electrons in LiNbO₃and LiTaO₃revealed by modulation X-ray diffraction

Fujimoto¹

1982

Acta Cryst Sect A

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“…Its room-temperature structure, studied by single-crystal X-ray diffraction (Abrahams, Reddy & Bernstein, 1966) and neutron diffraction (Abrahams, Hamilton & Reddy, 1966), is closely related to those of corundum and t Deceased 3rdFebruary 1997.…”

Section: Introductionmentioning

confidence: 97%

Synchrotron X-ray Studies of LiNbO₃ and LiTaO₃

Hsu¹,

Maslen²,

Boulay³

et al. 1997

Acta Crystallogr B Struct Sci

120

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“…7(c) and 7(d)]. Assuming local octahedral tilts and using simple geometrical relations, we have calculated the Sc-O-Ta, Sc-O-Nb, and Sc-O-Ru bond angles from the atomic distances (see Table III and long-range ferroelectric order such as LiNbO 3 and BiFeO 3 [51,52]. Still it is puzzling that according to XRD the structure is cubic, i.e., no tilting, whereas the EXAFS data suggest local octahedral tilting ϕ = [180−ࢬ(B -O-B )]/2 of approximately 20°not only in the vicinity of Ru dopant but also around the major B cation.…”

Section: Pst-ru and Psn-rumentioning

confidence: 99%

X-ray absorption spectroscopy of Ru-doped relaxor ferroelectrics with a perovskite-type structure

et al. 2014

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X-ray absorption near-edge structure and extended x-ray absorption fine structure spectroscopy at the Ru K edge of Ru-doped PbSc 0.5 Ta 0.5 O 3 (PST-Ru), PbSc 0.5 Nb 0.5 O 3 (PSN-Ru), and 0.9PbZn 1/3 Nb 2/3 O 3 -0.1PbTiO 3 (PZN-0.1PT-Ru) as well as at the Ta L 3 edge of PST-Ru and the Nb K edge of PSN-Ru was applied to study the short-and intermediate-range atomic arrangements in perovskite-type (ABO 3 ) relaxor ferroelectrics. The compounds were also analyzed by complementary Raman scattering, visible/near-visible absorption spectroscopy, and synchrotron x-ray single-crystal diffraction. The results show that Ru is octahedrally coordinated in all three relaxor host matrices but the average oxidation state of Ru in PST-Ru and PSN-Ru is ß4.4, whereas it is ß3.8 in PZN-0.1PT-Ru. In PbSc 0.5 B 0.5 O 3 (B = Ta, Nb) Ru substitutes for the B cations in the form of isolated point defects, while in PZN-0.1PT-Ru Ru replaces adjacent A and B sites, forming a chainlike structural species of face-sharing elongated octahedra. Chemical 1:1 B-site order as well as dynamic BO 6 tilting is observed around both the Ru dopant and the major B cation in PST-Ru and PSN-Ru regardless of the fact that according to x-ray diffraction at ambient conditions, the average structure is cubic with weak or no long-range chemical order. Pb cations are off-center displaced from the prototypic cubic A site for all three compounds and in Ru-doped PbSc 0.5 B 0.5 O 3 the BO 6 tilt angle correlates with the degree of coherent B-Pb distances.

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Ferroelectric lithium niobate. 4. Single crystal neutron diffraction study at 24°C

Cited by 179 publications

References 8 publications

Electric-field-induced ionic displacement and redistribution of bonding electrons in LiNbO₃and LiTaO₃revealed by modulation X-ray diffraction

Electric-field-induced ionic displacement and redistribution of bonding electrons in LiNbO₃and LiTaO₃revealed by modulation X-ray diffraction

Synchrotron X-ray Studies of LiNbO₃ and LiTaO₃

X-ray absorption spectroscopy of Ru-doped relaxor ferroelectrics with a perovskite-type structure

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Ferroelectric lithium niobate. 4. Single crystal neutron diffraction study at 24°C

Cited by 179 publications

References 8 publications

Electric-field-induced ionic displacement and redistribution of bonding electrons in LiNbO3and LiTaO3revealed by modulation X-ray diffraction

Electric-field-induced ionic displacement and redistribution of bonding electrons in LiNbO3and LiTaO3revealed by modulation X-ray diffraction

Synchrotron X-ray Studies of LiNbO3 and LiTaO3

X-ray absorption spectroscopy of Ru-doped relaxor ferroelectrics with a perovskite-type structure

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Electric-field-induced ionic displacement and redistribution of bonding electrons in LiNbO₃and LiTaO₃revealed by modulation X-ray diffraction

Electric-field-induced ionic displacement and redistribution of bonding electrons in LiNbO₃and LiTaO₃revealed by modulation X-ray diffraction

Synchrotron X-ray Studies of LiNbO₃ and LiTaO₃