Ordered Defect Lattice in Lithium Niobate Crystals

— Nominally undoped and doped LiNbO 3 crystals have been studied using full-profile analysis of X‑ray diffraction data and Raman spectroscopy. The X-ray diffraction patterns and Raman spectra of the crystals contain weak superstructure lines forbidden for space group R 3 c . The observed superstruct...

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Bibliographic Details
Published in:Inorganic materials 2019-07, Vol.55 (7), p.692-697
Main Authors: Aleshina, L. A., Sidorova, O. V., Kadetova, A. V., Sidorov, N. V., Teplyakova, N. A., Palatnikov, M. N.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Crystal defects
Crystal lattices
Crystals
Diffraction patterns
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Ions
Line spectra
Lithium niobates
Materials Science
Raman spectra
Raman spectroscopy
Spectrum analysis
Superstructures
Unit cell
X-ray diffraction
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Description
Summary:— Nominally undoped and doped LiNbO 3 crystals have been studied using full-profile analysis of X‑ray diffraction data and Raman spectroscopy. The X-ray diffraction patterns and Raman spectra of the crystals contain weak superstructure lines forbidden for space group R 3 c . The observed superstructure lines are not reflections from a second phase. The intensity distribution and position of the additional reflections are essentially independent of nonstoichiometry and dopant concentration. The additional lines in the Raman spectra and X-ray diffraction patterns of the crystals can result from the formation of an ordered hexagonal defect superstructure sublattice with a doubled a cell parameter relative to the fundamental unit cell.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168519070033