Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials
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Specific features of the defect structure of LiNbO3:B crystals

N.V. Sidorov, A.V. Kadetova, R.A. Titov, N.A. Teplyakova, M.N. Palatnikov

Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»

DOI: 10.26456/pcascnn/2022.14.235

Original article

Abstract: Specific features of the defect structure of nominally pure LiNbO3:B crystals were studied by the X-ray diffraction analysis. Nominally pure LiNbO3:B crystals were grown by Czochralski using the technology of the direct solid-phase doping of the congruent charge by orthoboric acid (H3BO3). The bonds lengths of Me-O in MeO6 clusters (Me-Li, Nb) determine the ferroelectric and nonlinear optical properties of the lithium niobate crystal. The values of these bonds in LiNbO3:B crystals differ significantly from the bonds lengths of the nominally pure congruent crystal LiNbO3cong. The differences in the bonds lengths are caused by a change in the properties of the boron-containing melt, technological parameters of the growth of LiNbO3:B crystals, and the localization of a trace amounts of boron in tetrahedral voids of the lithium niobate crystal structure. The results of the study of LiNbO3:B crystals were compared with those for nominally pure LiNbO3cong crystals and near-stoichiometric LiNbO3stoich (5,5 wt% K2O) ones.

Keywords: lithium niobate, crystal, defects, direct solid-phase doping, X-ray diffraction analysis

  • Nikolay V. Sidorov – Dr. Sc., Professor, Chief Researcher and as Head of the Vibrational Spectroscopy Sector of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
  • Alexandra V. Kadetova – postgraduate studen, Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
  • Roman A. Titov – Junior Researcher, Vibrational Spectroscopy Sector of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
  • Natalya A. Teplyakova – Ph. D., Senior Researcher, Vibrational Spectroscopy Sector of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»
  • Mikhail N. Palatnikov – Dr. Sc., Chief Researcher and as Head of the Electronic Engineering Materials Laboratory, Tananaev Institute of Chemistry  Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences»

Reference:

Sidorov, N.V. Specific features of the defect structure of LiNbO3:B crystals / N.V. Sidorov, A.V. Kadetova, R.A. Titov, N.A. Teplyakova, M.N. Palatnikov // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2022. — I. 14. — P. 235-242. DOI: 10.26456/pcascnn/2022.14.235. (In Russian).

Full article (in Russian): download PDF file

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